Algebra 1 : Linear Equations

Study concepts, example questions & explanations for Algebra 1

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Example Questions

Example Question #1 : How To Solve One Step Equations

What is the solution of 3x = 9? 

Possible Answers:

6

1/3

3

–6

–3

Correct answer:

3

Explanation:

When solving a one step equation like this, we do the inverse operation to isolate the variable. In this case, we have 3x = 9, so we divide both sides by 3 to get x = 3. 

3x = 9

(3x)/3 = (9)/3

x = 3

Example Question #2 : Algebra 1

Identify the imaginary part of the following complex number:

\(\displaystyle 1-3i\)

Possible Answers:

\(\displaystyle -2\)

\(\displaystyle -3\)

\(\displaystyle 1-3i\)

\(\displaystyle 1\)

\(\displaystyle i\)

Correct answer:

\(\displaystyle -3\)

Explanation:

A complex number in its standard form is of the form: \(\displaystyle a+bi\), where \(\displaystyle a\) stands for the real part and \(\displaystyle b\) stands for the imaginary part. The symbol \(\displaystyle i\) stands for \(\displaystyle \sqrt{-1}\).

The imaginary part is \(\displaystyle -3\).

Example Question #3 : Algebra 1

Find the conjugate of \(\displaystyle 1-3i\).

Possible Answers:

\(\displaystyle 3i\)

\(\displaystyle 1\)

\(\displaystyle 1+3i\)

\(\displaystyle 1-3i\)

\(\displaystyle 3i-1\)

Correct answer:

\(\displaystyle 1+3i\)

Explanation:

The conjugate is \(\displaystyle 1+3i\) so that when \(\displaystyle 1-3i\) is multiplied by its conjugate we get

\(\displaystyle 1^{2}-\left (3i^{} \right )^{2} = 1 - 9\left ( i^{2} \right )\)

Since \(\displaystyle i^{2}= -1\)

we get

\(\displaystyle 1-9(-1)=10\).

Example Question #4 : Algebra 1

Identify the real part of \(\displaystyle -3i\).

Possible Answers:

\(\displaystyle 0\)

\(\displaystyle -i\)

\(\displaystyle -3\)

\(\displaystyle i\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 0\)

Explanation:

A complex number in its standard form is of the form: \(\displaystyle a+bi\), where \(\displaystyle a\) stands for the real part and \(\displaystyle b\) stands for the imaginary part. The symbol \(\displaystyle i\) stands for \(\displaystyle \sqrt{-1}\).

The real part is 0.

In this problem there is no real part. Hence the real part equals 0.

Example Question #5 : Algebra 1

Identify the imaginary part of \(\displaystyle -3i\).

Possible Answers:

\(\displaystyle -i\)

\(\displaystyle 3\)

\(\displaystyle 0\)

\(\displaystyle i\)

\(\displaystyle -3\)

Correct answer:

\(\displaystyle -3\)

Explanation:

A complex number in its standard form is of the form: \(\displaystyle a+bi\), where \(\displaystyle a\) stands for the real part and \(\displaystyle b\) stands for the imaginary part. The symbol \(\displaystyle i\) stands for \(\displaystyle \sqrt{-1}\).

The imaginary part equals \(\displaystyle -3\) based on the definition of a complex number in standard form which is \(\displaystyle a+bi\).

 

Example Question #6 : Algebra 1

Identify the conjugate of \(\displaystyle -3i\).

Possible Answers:

\(\displaystyle -i\)

\(\displaystyle i\)

\(\displaystyle 3i\)

\(\displaystyle -3\)

\(\displaystyle -3i\)

Correct answer:

\(\displaystyle 3i\)

Explanation:

The conjugate of an imaginary number is the opposite of the given imaginary part. For example the conjugate of \(\displaystyle 3i\) is \(\displaystyle -3i\) and conjugate of \(\displaystyle -3i\) equals \(\displaystyle 3i\)

Example Question #1 : Algebra 1

Find the conjugate of \(\displaystyle -4\).

Possible Answers:

\(\displaystyle -i\)

\(\displaystyle 4i\)

\(\displaystyle -4i\)

\(\displaystyle i\)

\(\displaystyle -4\)

Correct answer:

\(\displaystyle -4\)

Explanation:

Since \(\displaystyle -4\) is a real number its conjugate is also \(\displaystyle -4\).

Example Question #8 : Algebra 1

Solve for \(\displaystyle x\):

\(\displaystyle \frac{4}{3}x-\frac{5}{6}=4\)

Possible Answers:

\(\displaystyle 3\frac{5}{6}\)

\(\displaystyle 3\frac{5}{8}\)

\(\displaystyle 4\frac{2}{3}\)

None of the available answers

\(\displaystyle 5\frac{1}{8}\)

Correct answer:

\(\displaystyle 3\frac{5}{8}\)

Explanation:

\(\displaystyle \frac{4}{3}x-\frac{5}{6}=4\)

First we will add \(\displaystyle \frac{5}{6}\) to both sides.

\(\displaystyle \frac{4}{3}x=4+\frac{5}{6}\)

\(\displaystyle \frac{4}{3}x=4\frac{5}{6}\)

Then we will multiple both sides by \(\displaystyle \frac{3}{4}\) to isolate \(\displaystyle x\).

\(\displaystyle x=4\frac{5}{6}\cdot\frac{3}{4}=(4+\frac{5}{6})\cdot\frac{3}{4}=\frac{12}{4}+\frac{15}{24}=3\frac{15}{24}=3\frac{5}{8}\)

Example Question #2 : Algebra 1

Solve for \(\displaystyle x\):

\(\displaystyle x+17=12\)

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle -29\)

\(\displaystyle 29\)

\(\displaystyle 5\)

\(\displaystyle -5\)

Correct answer:

\(\displaystyle -5\)

Explanation:

\(\displaystyle x+17-17=12-17\)

\(\displaystyle x=-5\)

Example Question #10 : Algebra 1

What is the value of \(\displaystyle x\)?

\(\displaystyle x+5=3x-1\)

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 5\)

\(\displaystyle 1\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 3\)

Explanation:

Simplifying for \(\displaystyle x+5=3x-1\) gives you  \(\displaystyle 2x=6\). Thus, the value of \(\displaystyle x\) is 3.

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