ASVAB Mathematics Knowledge Practice: Solving for Variables

By Consumer Dummies

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

  1. Solve for x: 4x + 6 = –30

    A. –8
    B. 4
    C. –9
    D. 9

  2. Solve for x: –10x + –23 = 23 + –8x

    A. –22
    B. 23
    C. –23
    D. –24

Answers and explanations

  1. The correct answer is Choice (C).

    Isolate x:


  2. 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: