ISEE Lower Level Math : Algebraic Concepts

Study concepts, example questions & explanations for ISEE Lower Level Math

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Example Questions

Example Question #161 : How To Find The Solution To An Equation

Which of the following makes this equation true:

\(\displaystyle 2x-1=11\)

Possible Answers:

\(\displaystyle x=4\)

\(\displaystyle x=1\)

\(\displaystyle x=2\)

\(\displaystyle x=7\)

\(\displaystyle x=6\)

Correct answer:

\(\displaystyle x=6\)

Explanation:

To answer the question, we will solve for x.  So, we get

\(\displaystyle 2x-1=11\)

\(\displaystyle 2x-1+1=11+1\)

\(\displaystyle 2x-0=12\)

\(\displaystyle 2x=12\)

\(\displaystyle \frac{2x}{2} = \frac{12}{2}\)

\(\displaystyle x=6\)

Example Question #162 : How To Find The Solution To An Equation

Solve for y in the following equation:

\(\displaystyle 9y+3=30\)

Possible Answers:

\(\displaystyle y=12\)

\(\displaystyle y=7\)

\(\displaystyle y=9\)

\(\displaystyle y=3\)

\(\displaystyle y=6\)

Correct answer:

\(\displaystyle y=3\)

Explanation:

To solve for ywe want y to stand alone.  So, we get

\(\displaystyle 9y+3=30\)

\(\displaystyle 9y+3-3=30-3\)

\(\displaystyle 9y+0=27\)

\(\displaystyle 9y=27\)

\(\displaystyle \frac{9y}{9} = \frac{27}{9}\)

\(\displaystyle y=3\)

Example Question #163 : How To Find The Solution To An Equation

Solve for \(\displaystyle x\)

\(\displaystyle 4x-5=11\)

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle -3\)

\(\displaystyle 6\)

\(\displaystyle 12\)

\(\displaystyle -2\)

Correct answer:

\(\displaystyle 4\)

Explanation:

First add \(\displaystyle 5\) to both sides of the equation:

\(\displaystyle 4x-5(+5)=11(+5)\)

\(\displaystyle 4x=16\)

Divide both sides by \(\displaystyle 4\):

\(\displaystyle \frac{4x}{4}=\frac{16}{4}\)

Reduce:

\(\displaystyle x=4\)

Example Question #161 : Algebraic Concepts

If x is equal to 6 and y is equal is -2, what is the value of \(\displaystyle \frac{y}{x}\)?

Possible Answers:

\(\displaystyle -3\)

\(\displaystyle -\frac{1}{3}\)

\(\displaystyle \frac{1}{3}\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle -\frac{1}{3}\)

Explanation:

If x is equal to 6 and y is equal is -2, the value of \(\displaystyle \frac{y}{x}\) can be solved by plugging in the values of x and y. This results in:

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