Question

Find the value of x in the picture below.(4x+20)(x-10)°

Answer 1

Supplementary angles are two angles that add up 180 degrees, since our two angles are supplementary:

(4x+20)+(x-10)=180

4x+20+x-10=180

5x+10=180

5x=180-10

5x=170

x=170/5

x=34