Question

Using the following diagram, which is the value of x ?

Answer 1

B

Explanation:

If you substitute the x values with 20 then the angles will add up to 180 on both sides. These angles are supplementary which means that they are suppose to add up to 180 degrees.

Answer 2

B. x = 20

Explanation:

angles on a straight line are supplementary

therefore, 6x+9 + 2x+11 = 180

so, 8x+20=180

8x = 160

x = 20