Question

The angles below are supplementary. What is the value of x? (5 points) A pair of supplementary angles is shown. One angle measures 3x + 40, and the other angle measures 80. a 16.6 b 20 c 26.7 d 40

Answer 1

b) 20

Explanation:

In supplementary angles, the sum of two angles add up to 180°

3x + 40 + 80 = 180

3x + 120 = 180

Subtract 120 from both sides,

3x = 180 - 120

3x = 60

Divide both sides by 3

x = 60 ÷ 3

`\boxed{\bf x = 20^\circ}`