Question

The angles below are supplementary. What is the value of x? A pair of supplementary angles is shown. One angle measures 4x + 20, and the other angle measures 40.

answers:

5

7.5

15

30

Answer 1

30

Explanation:

Answer 2

x = 30

Explanation:

If the angles are supplementary, that means that they add up to 180°.

That means 40 + 4x + 20 = 180°

Simplify: 60 + 4x = 180

Subtract: 4x = 120

Divide: x = 30