Question

How do you solve `4x-15<=21` and graph the solution on a number line?

Answer 1

`x <= 9`

Explanation:

`4x - 15 <= 21`
`4x <= 21 + 15`
`4x <= 36`
`x <= 9`
Answer by half closed interval: (-infinity, 9].
The end point (9) is included in the solution set.
Graph:

=============== 0 =========== 9 ---------------------------