Question

Two supplementary angles that are 4x and 5x what is the value of x

Answer 1

x = 20.

Explanation:

Supplementary angles sum to 180, so:

4x + 5x = 180

9x = 180

x = 20.

Answer 2

x = 20

Explanation:

4x + 5x = 9x

9x = 180 (supplementary angles add up to 180 degrees)

Divide 180/9 = 20