Algebra 1 : Linear Equations

Study concepts, example questions & explanations for Algebra 1

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Example Questions

Example Question #61 : Linear Equations

Solve for \(\displaystyle x\).

\(\displaystyle x+5=9\)

Possible Answers:

\(\displaystyle x=-2\)

\(\displaystyle x=14\)

\(\displaystyle x=4\)

\(\displaystyle x=11\)

Correct answer:

\(\displaystyle x=4\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle x+5=9\)

Subtract \(\displaystyle 5\) from both sides.

\(\displaystyle x+5-5=9-5\)

\(\displaystyle x=4\)

Example Question #61 : Algebra 1

Solve for \(\displaystyle x\).

\(\displaystyle -6+x=10\)

Possible Answers:

\(\displaystyle x=8\)

\(\displaystyle x=2\)

\(\displaystyle x=16\)

\(\displaystyle x=4\)

Correct answer:

\(\displaystyle x=16\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle -6+x=10\)

Add \(\displaystyle 6\) to both sides of the equation.

\(\displaystyle 6-6+x=10+6\)

\(\displaystyle x=16\)

Example Question #61 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

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

Possible Answers:

\(\displaystyle x=15\)

\(\displaystyle x=-2\)

\(\displaystyle x=8\)

\(\displaystyle x=2\)

Correct answer:

\(\displaystyle x=8\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

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

Add \(\displaystyle 3\) to both sides of the equation. 

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

\(\displaystyle x=8\)

Example Question #61 : Algebra 1

Solve for \(\displaystyle x\):

\(\displaystyle x-16=-9\)

Possible Answers:

\(\displaystyle x=-26\)

\(\displaystyle x=7\)

\(\displaystyle x=10\)

\(\displaystyle x=-7\)

Correct answer:

\(\displaystyle x=7\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle x-16=-9\)

Add \(\displaystyle 16\) to both sides of the equation. 

\(\displaystyle x-16+16=-9+16\)

\(\displaystyle x=7\)

Example Question #65 : Algebra 1

Solve for \(\displaystyle x\):

\(\displaystyle x+2=-5\)

Possible Answers:

\(\displaystyle x=4\)

\(\displaystyle x=7\)

\(\displaystyle x=-7\)

\(\displaystyle x=-3\)

Correct answer:

\(\displaystyle x=-7\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle x+2=-5\)

Subtract \(\displaystyle 2\) from both sides.

\(\displaystyle x+2-2=-5-2\)

\(\displaystyle x=-7\)

Example Question #62 : Algebra 1

Solve for \(\displaystyle x\):

\(\displaystyle 18+x=26\)

Possible Answers:

\(\displaystyle x=44\)

\(\displaystyle x=-8\)

\(\displaystyle x=21\)

\(\displaystyle x=8\)

Correct answer:

\(\displaystyle x=8\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle 18+x=26\)

Subtract \(\displaystyle 18\) from both sides.

\(\displaystyle 18-18+x=26-18\)

\(\displaystyle x=8\)

Example Question #61 : Linear Equations

Solve for \(\displaystyle x\):

\(\displaystyle 5x=15\)

Possible Answers:

\(\displaystyle x=75\)

\(\displaystyle x=5\)

\(\displaystyle x=2\)

\(\displaystyle x=3\)

Correct answer:

\(\displaystyle x=3\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle 5x=15\)

Divide both sides by \(\displaystyle 5\).

\(\displaystyle \frac{5x}{5}=\frac{15}{5}\)

\(\displaystyle x=3\)

Example Question #61 : How To Solve One Step Equations

Solve for \(\displaystyle x\):

\(\displaystyle 14x=224\)

Possible Answers:

\(\displaystyle x=18\)

\(\displaystyle x=12\)

\(\displaystyle x=14\)

\(\displaystyle x=16\)

Correct answer:

\(\displaystyle x=16\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle 14x=224\)

Divide both sides by \(\displaystyle 14\).

\(\displaystyle \frac{14x}{14}=\frac{224}{14}\)

\(\displaystyle x=16\)

Example Question #61 : Linear Equations

Solve for \(\displaystyle x\):

\(\displaystyle 7x=126\)

Possible Answers:

\(\displaystyle x=20\)

\(\displaystyle x=16\)

\(\displaystyle x=12\)

\(\displaystyle x=18\)

Correct answer:

\(\displaystyle x=18\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle 7x=126\)

Divide both sides by \(\displaystyle 7\).

\(\displaystyle \frac{7x}{7}=\frac{126}{7}\)

\(\displaystyle x=18\)

Example Question #69 : Algebra 1

Solve for \(\displaystyle x\):

\(\displaystyle \frac{x}{6}=-2\)

Possible Answers:

\(\displaystyle x=-3\)

\(\displaystyle x=-12\)

\(\displaystyle x=-2\)

\(\displaystyle x=-4\)

Correct answer:

\(\displaystyle x=-12\)

Explanation:

In order to solve for \(\displaystyle x\), we want to isolate it on one side of the equation.

\(\displaystyle \frac{x}{6}=-2\)

Multiply both sides by \(\displaystyle 6\).

\(\displaystyle 6\times\frac{x}{6}=-2\times6\)

\(\displaystyle x=-12\)

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