Question

How do you solve the inequality `abs(9-4x)<=0`?

Answer 1

This is a special case.

Explanation:

Since any absolute value, such as the one in our problem, is always greater than or equal to zero, the only solutions to
`| 9 - 4x | <=0` occur when `9 - 4x = 0`. Simply solve this linear equation for x, and you will have the solution.