Algebra 1 : How to solve one-step equations

Study concepts, example questions & explanations for Algebra 1

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Example Questions

Example Question #291 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle x-86=23\)

Possible Answers:

\(\displaystyle 109\)

\(\displaystyle 63\)

\(\displaystyle 24\)

\(\displaystyle -63\)

\(\displaystyle -109\)

Correct answer:

\(\displaystyle 109\)

Explanation:

\(\displaystyle x-86=23\) Add \(\displaystyle 86\) to both sides.

\(\displaystyle x=109\)

Example Question #292 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle x-18=-29\)

Possible Answers:

\(\displaystyle -11\)

\(\displaystyle 11\)

\(\displaystyle 13\)

\(\displaystyle 47\)

\(\displaystyle -47\)

Correct answer:

\(\displaystyle -11\)

Explanation:

\(\displaystyle x-18=-29\) Add \(\displaystyle 18\) on both sides. Since \(\displaystyle 29\) is greater than \(\displaystyle 18\) and is negative, our answer is negative. We treat as a normal subtraction.

\(\displaystyle x=-11\)

Example Question #293 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle x-54=-46\)

Possible Answers:

\(\displaystyle 25\)

\(\displaystyle -100\)

\(\displaystyle -8\)

\(\displaystyle 100\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 8\)

Explanation:

\(\displaystyle x-54=-46\) Add \(\displaystyle 54\) to both sides. Since \(\displaystyle 54\) is greater than \(\displaystyle 46\) and is positive, our answer is positive. We treat as a normal subtraction.

\(\displaystyle x=8\)

Example Question #294 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle 4x=80\)

Possible Answers:

\(\displaystyle 60\)

\(\displaystyle 160\)

\(\displaystyle 20\)

\(\displaystyle 40\)

\(\displaystyle 320\)

Correct answer:

\(\displaystyle 20\)

Explanation:

\(\displaystyle 4x=80\) Divide \(\displaystyle 4\) on both sides.

\(\displaystyle x=20\)

Example Question #295 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle 7x=-119\)

Possible Answers:

\(\displaystyle 17\)

\(\displaystyle 27\)

\(\displaystyle -27\)

\(\displaystyle -17\)

\(\displaystyle 22\)

Correct answer:

\(\displaystyle -17\)

Explanation:

\(\displaystyle 7x=-119\) Divide \(\displaystyle 7\) on both sides. When dividing with a negative number, our answer is negative.

\(\displaystyle x=-17\)

 

Example Question #296 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle -6x=-732\)

Possible Answers:

\(\displaystyle 122\)

\(\displaystyle -122\)

\(\displaystyle 112\)

\(\displaystyle -112\)

\(\displaystyle 132\)

Correct answer:

\(\displaystyle 122\)

Explanation:

\(\displaystyle -6x=-732\) Divide both sides by \(\displaystyle -6\). When dividing with another negative number, the answer is positive.

\(\displaystyle x=122\)

Example Question #297 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle \frac{x}{9}=23\)

Possible Answers:

\(\displaystyle 207\)

\(\displaystyle 187\)

\(\displaystyle 227\)

\(\displaystyle 197\)

\(\displaystyle 217\)

Correct answer:

\(\displaystyle 207\)

Explanation:

\(\displaystyle \frac{x}{9}=23\) Multiply \(\displaystyle 9\) on both sides.

\(\displaystyle x=207\)

Example Question #298 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle \frac{x}{-4}=48\)

Possible Answers:

\(\displaystyle 192\)

\(\displaystyle 182\)

\(\displaystyle 162\)

\(\displaystyle -192\)

\(\displaystyle -162\)

Correct answer:

\(\displaystyle -192\)

Explanation:

\(\displaystyle \frac{x}{-4}=48\) Multiply \(\displaystyle -4\) on both sides. When multiplying with a positive number, our answer is negative.

\(\displaystyle x=-192\)

Example Question #299 : How To Solve One Step Equations

Solve for \(\displaystyle x\).

\(\displaystyle \frac{x}{-11}=-19\)

Possible Answers:

\(\displaystyle 219\)

\(\displaystyle 199\)

\(\displaystyle 209\)

\(\displaystyle -209\)

\(\displaystyle -199\)

Correct answer:

\(\displaystyle 209\)

Explanation:

\(\displaystyle \frac{x}{-11}=-19\) Multiply \(\displaystyle -11\) on both sides. When multiplying with another negative number, our answer is positive.

\(\displaystyle x=209\)

Example Question #300 : How To Solve One Step Equations

Solve for \(\displaystyle x\) in the following equations:

\(\displaystyle \frac{x}{-4} = -7\)

Possible Answers:

\(\displaystyle x=28\)

\(\displaystyle x=-28\)

\(\displaystyle x=32\)

\(\displaystyle x=-3\)

\(\displaystyle x=-11\)

Correct answer:

\(\displaystyle x=28\)

Explanation:

To solve, we need to get \(\displaystyle x\) alone.  To do that, multiply both sides by \(\displaystyle -4\)

\(\displaystyle \frac{x}{-4} = -7\)

\(\displaystyle \frac{x}{-4} \cdot -4 = -7 \cdot -4\)

\(\displaystyle x = 28\)

 

Remember that a negative times a negative is a positive.  So, the answer is \(\displaystyle 28\).

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