High School Math : How to solve one-step equations with integers in pre-algebra

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #21 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle 2x=4\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 4\)

\(\displaystyle 1\)

\(\displaystyle 2\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To solve \(\displaystyle 2x=4\), we need to isolate \(\displaystyle x\). That means we need to divide both sides by \(\displaystyle 2\).

\(\displaystyle \frac{2x}{2}=\frac{4}{2}\)

\(\displaystyle x=2\)

Example Question #22 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle 5x=13\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 13\tfrac{1}{5}\)

\(\displaystyle 3\tfrac{2}{5}\)

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

\(\displaystyle 2\tfrac{3}{5}\)

Correct answer:

\(\displaystyle 2\tfrac{3}{5}\)

Explanation:

To solve \(\displaystyle 5x=13\), we need to isolate \(\displaystyle x\). That means we have to divide both sides by \(\displaystyle 5\).

\(\displaystyle \frac{5x}{5}=\frac{13}{5}\)

\(\displaystyle x=\frac{13}{5}\)

\(\displaystyle \frac{13}{5}\) is an improper fraction, so convert it to \(\displaystyle 2\tfrac{3}{5}\).

Example Question #23 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle x+12=32\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 384\)

\(\displaystyle 20\)

\(\displaystyle 2\tfrac{2}{3}\)

\(\displaystyle 44\)

\(\displaystyle 10\)

Correct answer:

\(\displaystyle 20\)

Explanation:

To solve \(\displaystyle x+12=32\), isolate \(\displaystyle x\). That means subtracting \(\displaystyle 12\) from both sides.

\(\displaystyle x+12=32\)

\(\displaystyle x+12-12=32-12\)

\(\displaystyle x=32-12\)

\(\displaystyle x=20\)

Example Question #24 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle 2x=16\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 16\)

\(\displaystyle 32\)

\(\displaystyle 14\)

\(\displaystyle 18\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 8\)

Explanation:

To solve \(\displaystyle 2x=16\), we need to isolate \(\displaystyle x\). That means we need to divide both sides by \(\displaystyle 2\).

\(\displaystyle 2x=16\)

\(\displaystyle \frac{2x}{2}=\frac{16}{2}\)

\(\displaystyle x=\frac{16}{2}\)

\(\displaystyle x=8\)

Example Question #25 : How To Solve One Step Equations With Integers In Pre Algebra

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

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 12\)

\(\displaystyle 14\)

\(\displaystyle 24\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 24\)

Explanation:

To solve \(\displaystyle \frac{x}{2}=12\), we need to multiply both sides by \(\displaystyle 2\).

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

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

\(\displaystyle x=12*2\)

\(\displaystyle x=24\)

Example Question #26 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle x-4=22\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 11\)

\(\displaystyle 88\)

\(\displaystyle 26\)

\(\displaystyle 5\tfrac{1}{2}\)

Correct answer:

\(\displaystyle 26\)

Explanation:

To solve \(\displaystyle x-4=22\), add \(\displaystyle 4\) to both sides to isolate our variable.

\(\displaystyle 4+x-4=22+4\)

\(\displaystyle x=22+4\)

\(\displaystyle x=26\)

Example Question #27 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle x+49=300\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 249\)

\(\displaystyle 351\)

\(\displaystyle 251\)

\(\displaystyle 259\)

\(\displaystyle 349\)

Correct answer:

\(\displaystyle 251\)

Explanation:

To solve for \(\displaystyle x\), we need to isolate our variable. That means that we want ONLY the \(\displaystyle x\) on the left side of the equation.

\(\displaystyle x+49=300\)

Subtract \(\displaystyle 49\) from both sides.

\(\displaystyle x+49-49=300-49\)

\(\displaystyle x=300-49\)

\(\displaystyle x=251\)

Example Question #28 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle x+18=4\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 14\)

\(\displaystyle 22\)

\(\displaystyle \frac{2}{9}\)

\(\displaystyle -22\)

\(\displaystyle -14\)

Correct answer:

\(\displaystyle -14\)

Explanation:

To solve for \(\displaystyle x\), we need to isolate our variable. That means that we want ONLY the \(\displaystyle x\) on the left side of the equation.

\(\displaystyle x+18=4\)

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

\(\displaystyle x+18-18=4-18\)

\(\displaystyle x=4-18\)

\(\displaystyle x=-14\)

Example Question #29 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle 2x=32\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 34\)

\(\displaystyle 32\)

\(\displaystyle 16\)

\(\displaystyle 64\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 16\)

Explanation:

To solve for \(\displaystyle x\), the first thing we need to do is isolate the variable. That means we want ONLY \(\displaystyle x\) on the left side of the equation.

\(\displaystyle 2x=32\)

Divide both sides by \(\displaystyle 2\).

\(\displaystyle \frac{2x}{2}=\frac{32}{2}\)

\(\displaystyle x=\frac{32}{2}\)

\(\displaystyle x=16\)

Example Question #30 : How To Solve One Step Equations With Integers In Pre Algebra

\(\displaystyle x-25=5\)

Solve for \(\displaystyle x\).

Possible Answers:

\(\displaystyle 30\)

\(\displaystyle 20\)

\(\displaystyle 25\)

\(\displaystyle 5\)

\(\displaystyle 125\)

Correct answer:

\(\displaystyle 30\)

Explanation:

To solve for \(\displaystyle x\), we need to isolate our variable. That means that we want ONLY the \(\displaystyle x\) on the left side of the equation.

\(\displaystyle x-25=5\)

Add \(\displaystyle 25\) to both sides.

\(\displaystyle x-25+25=5+25\)

\(\displaystyle x=5+25\)

\(\displaystyle x=30\)

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