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Linear Algebra : Linear Equations

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Example Questions

Example Question #91 : Linear Equations

Consider the system of linear equations:

x + 2y + 3z + w = 0

2x+ 5y - z - w = 0

Which of the following expresses the solution set in parametric form?

Possible Answers:

(-17t-7u, 7t+3u, t, u )

None of the other choices gives the correct response.

(17t+7u, 7t-3u, t, u )

( 11t-5u, -7t-3u, t, u )

(-11t+5u, 7t+3u, t, u )

Correct answer:

(-17t-7u, 7t+3u, t, u )

Explanation:

First, write the matrix of coefficients for the system, seen below:

$\begin{bmatrix} 1&2 &3 &1 \\ 2& 5&-1 & -1 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \end{bmatrix}$

It is necessary to convert this matrix to reduced row-echelon form as follows:

The first step is usually to get a leading "1" in the first row; however, one is already there.

The next step is to get a "0" in the first position of the second row by multiplying the first row by the additive inverse of the number already there, and adding it to that row. Therefore, perform the operation

$-2R1 + R2 \rightarrow R2$ :

$\begin{bmatrix} 1&2 &3 &1 \\-2(1)+ 2& -2(2)+5&-2(3)+( -1 )&- 2(1)+ (-1) \end{matrix}$ $\begin{vmatrix} 0\\ -2(0)+0 \end{bmatrix}$

$\begin{bmatrix} 1&2 &3 &1 \\0& 1&-7&- 3 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \end{bmatrix}$

The next step is usually to get a leading "1" in the second row; however, one is already there.

The next step is to get a "0" in the second position of the first row by multiplying the first row by the additive inverse of the number already there, and adding it to that row. Therefore, perform the operation:

$-2R2 + R1 \rightarrow R1$

$\begin{bmatrix}-2(0)+ 1&-2(1)+2 &-2(-7)+ 3 &-2(-3)+1 \\0& 1&-7&- 3 \end{matrix}$ $\begin{vmatrix} -2(0)+ 0\\ 0 \end{bmatrix}$

$\begin{bmatrix} 1&0&17 &7 \\0& 1&-7&- 3 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \end{bmatrix}$

The matrix is now in reduced row-echelon form - all leading nonzero elements are "1", and go from upper-left to lower-right, and there are no zero rows. This matrix translates as the linear equations

x+ 17z+7w = 0

y -7z-3w = 0

To state the solution set parametrically, rewrite:

x =- 17z-7w

y =7z+3w

Set t = z, u = w ; the parametric form of the solution set is

(-17t-7u, 7t+3u, t, u ) .

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Example Question #91 : Linear Equations

Consider the system of linear equations:

x+ 2y - 4z = 0

x+ 4y - 2z = 0

x - 6z = 0

Which of the following gives its complete solution set (in parametric form, if applicable) or its only solution?

Possible Answers:

(-6t, t,t )

(6t,-t,t )

(0,0,0)

(-6t, -t,t )

(6t, t,t )

Correct answer:

(6t,-t,t )

Explanation:

First, write the matrix of coefficients for the system, seen below:

$\begin{bmatrix} 1&2 &-4 \\ 1 & 4 & -2 \\ 1 & 0 & -6 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \\ 0 \end{bmatrix}$

It is necessary to convert this matrix to reduced row-echelon form as follows:

The first step is usually to get a leading "1" in the first row; however, one is already there.

The next two steps, which can be performed simultaneously, is to get a "0" in the first position of the second and third rows by multiplying the first row by the additive inverse of the number already there, and adding it to that row. Therefore, perform the operations

$-R1+ R2 \rightarrow R2$

and

$-R1+ R3 \rightarrow R3$

$\begin{bmatrix} 1&2 &-4 \\ -1 +1 &-2+ 4 & -(-4)+ (-2) \\ -1+ 1 & -2+ 0 & -(-4) + (-6) \end{matrix}$ $\begin{vmatrix} -0+ 0\\ -0+ 0 \\ -0 + 0 \end{bmatrix}$

$\begin{bmatrix} 1&2 &-4 \\ 0 &2 &2\\ 0 & -2 & -2 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \\ 0 \end{bmatrix}$

The next step is to get a leading "1" in the second rowby multiplying each entry in that row by the multiplicative inverse of the number already there; therefore, perform the operation

$0.5 R2 \rightarrow R2$

$\begin{bmatrix} 1&2 &-4 \\0.5\cdot 0 &0.5\cdot 2 &0.5\cdot 2\\ 0 & -2 & -2 \end{matrix}$ $\begin{vmatrix} 0\\ 0.5\cdot 0 \\ 0 \end{bmatrix}$

$\begin{bmatrix} 1&2 &-4 \\ 0 &1 &1 \\ 0 & -2 & -2 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \\ 0 \end{bmatrix}$

The next two steps, which can be performed simultaneously, is to get a "0" in the second position of the first and third rows by multiplying the first row by the additive inverse of the number already there, and adding it to that row. Therefore, perform the operations

$-2R2+ R1 \rightarrow R1$

and

$2R2+ R3 \rightarrow R3$

$\begin{bmatrix} -2(0)+1&-2(1)+2 &-2(1)+ (-4 )\\ 0 &1 &1 \\ 2(0)+0 & 2(1)+ (-2) & 2(1)+ (-2) \end{matrix}$ $\begin{vmatrix}-2(0)+ 0\\ 0 \\2(0)+ 0 \end{bmatrix}$

$\begin{bmatrix} 1&0 &-6\\ 0 &1 &1 \\ 0 & 0 & 0 \end{matrix}$ $\begin{vmatrix} 0\\ 0 \\ 0 \end{bmatrix}$

The matrix is now in reduced row-echelon form - all leading nonzero elements are "1", and go from upper-left to lower-right, and there are no zero rows. This matrix translates as the linear equations

x-6z = 0

y+ z= 0

To state the solution set parametrically, rewrite:

x= 6z

y = -z

Set t = z ; the parametric form of the solution set is

(6t,-t,t ) .

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Example Question #92 : Linear Equations

Solve the following system by reducing its corresponding matrix.

x_1+2x_2=0

2x_1+4x_2=0

Possible Answers:

None of these

x_1=x_2 and x_2 is a free variable.

x_1=2x_2 and x_2 is a free variable.

x_1=-2x_2 and x_2 is a free variable.

Correct answer:

x_1=-2x_2 and x_2 is a free variable.

Explanation:

The corresponding matrix is

$\begin{pmatrix} 1& 2& 0\\ 2& 4& 0 \end{pmatrix}$

We add times row one to row two.

$\begin{pmatrix} 1& 2& 0\\ 2+(-2)& 4+(-4)& 0+0 \end{pmatrix}=\begin{pmatrix} 1& 2&0 \\ 0&0 &0 \end{pmatrix}$

This yields the solution

x_1+2x_2=0

x_1=-2x_2 and x_2 is a free variable.

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Example Question #1 : Non Homogeneous Cases

$\begin{align*}&\text{Find }\begin{bmatrix}x\\y\\z\end{bmatrix}\\&\text{for the system: }\begin{bmatrix}-3&-15&6\\15&-9&14\\-18&-5&-10\end{bmatrix}\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-14\\5\\-8\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}11.086\\3.1452\\-0.92742\end{bmatrix}$

$\begin{bmatrix}-2.914\\-10.8548\\-14.9274\end{bmatrix}$

$\begin{bmatrix}8.086\\0.14516\\-3.9274\end{bmatrix}$

$\begin{bmatrix}5.086\\-2.8548\\-6.9274\end{bmatrix}$

Correct answer:

$\begin{bmatrix}5.086\\-2.8548\\-6.9274\end{bmatrix}$

Explanation:

$- ¬\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}-3&-15&6\\15&-9&14\\-18&-5&-10\end{bmatrix}\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-14\\5\\-8\end{bmatrix}\\&\text{an approach often taught is to manipulate coefficients to eliminate}\\&\text{variables. There is another to consider.}\\&\text{Note that if a matrix has an inverse, }\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{Knowing this, it stands to reason that if given an equation like: }Ax=B\\&\text{We can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{With this property we can solve our system:}\\&\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-0.43011&0.48387&0.41935\\0.27419&-0.37097&-0.35484\\0.6371&-0.68548&-0.67742\end{bmatrix}\begin{bmatrix}-14\\5\\-8\end{bmatrix}\\&\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}5.086\\-2.8548\\-6.9274\end{bmatrix}\end{align*}$

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Example Question #2 : Non Homogeneous Cases

$\begin{align*}&\text{Find the values of }\begin{bmatrix}x\\y\end{bmatrix}\\&\text{for the function: }\begin{bmatrix}7&15\\0&-18\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-8\\6\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}2.57\\2.67\end{bmatrix}$

$\begin{bmatrix}-8.43\\-8.33\end{bmatrix}$

$\begin{bmatrix}-0.43\\-0.33\end{bmatrix}$

$\begin{bmatrix}-5.43\\-5.33\end{bmatrix}$

Correct answer:

$\begin{bmatrix}-0.43\\-0.33\end{bmatrix}$

Explanation:

$\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}7&15\\0&-18\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-8\\6\end{bmatrix}\\&\text{an approach often taught is to manipulate coefficients to eliminate}\\&\text{variables. This approach works, though there is another to consider.}\\&\text{If a matrix has an inverse, i.e. it has a determinant,}\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{It then stands to reason that if given an equation like: }Ax=B\\&\text{We can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{Using this, we can solve for our values:}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}0.143&0.119\\0.000&-0.056\end{bmatrix}\begin{bmatrix}-8\\6\end{bmatrix}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-0.43\\-0.33\end{bmatrix}\end{align*}$

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Example Question #1 : Non Homogeneous Cases

$\begin{align*}&\text{Find }\begin{bmatrix}x\\y\end{bmatrix}\\&\text{for the system: }\begin{bmatrix}12&-6\\-2&-5\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}7\\3\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}0.24\\-0.69\end{bmatrix}$

$\begin{bmatrix}2.24\\1.31\end{bmatrix}$

$\begin{bmatrix}5.24\\4.31\end{bmatrix}$

$\begin{bmatrix}7.24\\6.31\end{bmatrix}$

Correct answer:

$\begin{bmatrix}0.24\\-0.69\end{bmatrix}$

Explanation:

$\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}12&-6\\-2&-5\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}7\\3\end{bmatrix}\\&\text{an approach often taught is to manipulate coefficients to eliminate}\\&\text{variables. This approach works, though there is another to consider.}\\&\text{If a matrix has an inverse, i.e. it has a determinant,}\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{It then stands to reason that if given an equation like: }Ax=B\\&\text{We can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{With this property we can solve our system:}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}0.069&-0.083\\-0.028&-0.167\end{bmatrix}\begin{bmatrix}7\\3\end{bmatrix}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}0.24\\-0.69\end{bmatrix}\end{align*}$

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Example Question #4 : Non Homogeneous Cases

$\begin{align*}&\text{Find }\begin{bmatrix}x\\y\end{bmatrix}\\&\text{for the system: }\begin{bmatrix}12&18\\-20&6\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}7\\-10\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}4.51\\4.05\end{bmatrix}$

$\begin{bmatrix}3.51\\3.05\end{bmatrix}$

$\begin{bmatrix}0.51\\0.05\end{bmatrix}$

$\begin{bmatrix}-8.49\\-8.95\end{bmatrix}$

Correct answer:

$\begin{bmatrix}0.51\\0.05\end{bmatrix}$

Explanation:

$\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}12&18\\-20&6\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}7\\-10\end{bmatrix}\\&\text{an approach often taught is to manipulate coefficients to eliminate}\\&\text{variables. This approach works, though there is another to consider.}\\&\text{If a matrix has an inverse, i.e. it has a determinant,}\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{It then stands to reason that if given an equation like: }Ax=B\\&\text{We can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{With this property we can solve our system:}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}0.014&-0.042\\0.046&0.028\end{bmatrix}\begin{bmatrix}7\\-10\end{bmatrix}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}0.51\\0.05\end{bmatrix}\end{align*}$

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Example Question #5 : Non Homogeneous Cases

$\begin{align*}&\text{Find }\begin{bmatrix}x\\y\\z\end{bmatrix}\\&\text{for the system: }\begin{bmatrix}13&-19&-4\\-10&-1&16\\-9&4&-19\end{bmatrix}\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-138\\134\\-122\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}4.87\\10.81\\13.97\end{bmatrix}$

$\begin{bmatrix}1.87\\7.81\\10.97\end{bmatrix}$

$\begin{bmatrix}7.87\\13.81\\16.97\end{bmatrix}$

$\begin{bmatrix}-1.13\\4.81\\7.97\end{bmatrix}$

Correct answer:

$\begin{bmatrix}-1.13\\4.81\\7.97\end{bmatrix}$

Explanation:

$\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}13&-19&-4\\-10&-1&16\\-9&4&-19\end{bmatrix}\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-138\\134\\-122\end{bmatrix}\\&\text{a common approach is to manipulate coefficients to eliminate}\\&\text{variables. This works, though there is another to consider.}\\&\text{If a matrix has an inverse,}\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{It then stands to reason that if given an equation like: }Ax=B\\&\text{We can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{With this property we can solve our system:}\\&\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-0.008&-0.063&-0.052\\-0.056&-0.048&-0.028\\-0.008&0.020&-0.034\end{bmatrix}\begin{bmatrix}-138\\134\\-122\end{bmatrix}\\&\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-1.13\\4.81\\7.97\end{bmatrix}\end{align*}$

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Example Question #2 : Non Homogeneous Cases

$\begin{align*}&\text{Solve the system of equations: }\begin{bmatrix}-5&-16\\19&-3\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-167\\87\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}5.93\\8.58\end{bmatrix}$

$\begin{bmatrix}-1.07\\1.58\end{bmatrix}$

$\begin{bmatrix}-0.07\\2.58\end{bmatrix}$

$\begin{bmatrix}7.93\\10.58\end{bmatrix}$

Correct answer:

$\begin{bmatrix}5.93\\8.58\end{bmatrix}$

Explanation:

$\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}-5&-16\\19&-3\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-167\\87\end{bmatrix}\\&\text{a common approach is to manipulate coefficients to eliminate}\\&\text{variables. This works, though there is another way to consider.}\\&\text{If a matrix has an inverse,}\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{As such, if given an equation like: }Ax=B\\&\text{we can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{With this, we can solve our system of equations:}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}-0.009&0.050\\-0.060&-0.016\end{bmatrix}\begin{bmatrix}-167\\87\end{bmatrix}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}5.93\\8.58\end{bmatrix}\end{align*}$

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Example Question #7 : Non Homogeneous Cases

$\begin{align*}&\text{Find }\begin{bmatrix}x\\y\end{bmatrix}\\&\text{for the system: }\begin{bmatrix}4&18\\-16&16\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}20\\-29\end{bmatrix}\end{align*}$

Possible Answers:

$\begin{bmatrix}-2.61\\-4.42\end{bmatrix}$

$\begin{bmatrix}3.39\\1.58\end{bmatrix}$

$\begin{bmatrix}2.39\\0.58\end{bmatrix}$

$\begin{bmatrix}-5.61\\-7.42\end{bmatrix}$

Correct answer:

$\begin{bmatrix}2.39\\0.58\end{bmatrix}$

Explanation:

$\begin{align*}&\text{When faced with a system of equations like the}\\&\text{one represented by }\\&\begin{bmatrix}4&18\\-16&16\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}20\\-29\end{bmatrix}\\&\text{a common approach is to manipulate coefficients to eliminate}\\&\text{variables. This works, though there is another way to consider.}\\&\text{If a matrix has an inverse,}\\&\text{then the product of that matrix and its inverse is the identity matrix:}\\&A^{-1}A=AA^{-1}=I\\&\text{As such, if given an equation like: }Ax=B\\&\text{we can isolate x as follows:}\\&A^{-1}Ax=A^{-1}B\\&x=A^{-1}B\\&\text{With this property we can solve our system:}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}0.045&-0.051\\0.045&0.011\end{bmatrix}\begin{bmatrix}20\\-29\end{bmatrix}\\&\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}2.39\\0.58\end{bmatrix}\end{align*}$

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Linear Algebra : Linear Equations

Study concepts, example questions & explanations for Linear Algebra

All Linear Algebra Resources

Example Questions

Example Question #91 : Linear Equations

Example Question #91 : Linear Equations

Example Question #92 : Linear Equations

Example Question #1 : Non Homogeneous Cases

Example Question #2 : Non Homogeneous Cases

Example Question #1 : Non Homogeneous Cases

Example Question #4 : Non Homogeneous Cases

Example Question #5 : Non Homogeneous Cases

Example Question #2 : Non Homogeneous Cases

Example Question #7 : Non Homogeneous Cases

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