posted by Jane

Please solve and explain how to solve the compound inequality:

4 < 4a +3 < 18

  1. Steve

    a compound inequality is just two inequalities. Solve each one.

    4 < 4a+3
    1 < 4a
    1/4 < a

    4a+3 < 18
    4a < 15
    a < 15/4

    so, the solution is

    1/4 < a < 15/4

    or, you can indeed solve it as a combination, if it's relatively simple, as this one is.

    4 < 4a+3 < 18
    subtract 3 all across
    1 < 4a < 15
    divide by 4
    1/4 < a < 15/4

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