Question

Solve the inequality |6x + 2| < 10 and graph its solution.

Answer 1

Answer:

  -2 < x < 4/3

Step-by-step explanation:

A graphing calculator can show you the solution. I like to recast the equation as a comparison to zero, since a graphing calculator often can display zeros of a function easily. Here that means ...

  |6x +2| -10 < 0

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If you want to solve this by hand, you can "unfold" the absolute value to get ...

  -10 < 6x +2 < 10

  -12 < 6x < 8 . . . . . . subtract 2

  -12/6 < x < 8/6 . . . . divide by 6

  -2 < x < 4/3 . . . . . . simplify

This graphs on the number line as a solid line between open circles at -2 and 4/3. On the attached graph, the boundary values are shown as dotted blue lines, and the solution space is shown in blue.