# ASVAB Mathematics Knowledge Practice: Solving for Variables

The Mathematics Knowledge subtest on the ASVAB contains a lot of questions where you’re asked to solve for a variable in an algebraic equation. The best way to do this is to isolate that variable.

## Practice questions

- Solve for
*x*: 4*x*+ 6 = –30**A.**–8

**B.**4

**C.**–9

**D.**9 - Solve for
*x*: –10*x*+ –23 = 23 + –8*x*

**A.**–22

**B.**23

**C.**–23

**D.**–24

## Answers and explanations

- The correct answer is
**Choice (C).**Isolate

*x*: - The correct answer is
**Choice (C).**Put the variables on the same side of the equation:

Isolate

*x*by dividing both sides of the equation by –2: