Question

How do you graph and solve `| 9-4x | ≤ 15`?

Answer 1

`-2/3<=x<=6`.

Explanation:

|9-4x| is either 9-4x 0r 4x-9.

In the first case, `9-4x<= 15` . This gives `-4x<= 6`, which means `x>= -3/2`.

In the second case `4x-9 <= 15`. This gives `x<= 6`.

Thus `-2/3<=x<=6`.