Question

Use the image to the right to answer the questions:

a. What theorems would/could you use to find x?
b. Find the value of x.
Thank you so much in advance! :)

Answer 1

a. Linear pair theorem

b. x = 40

Explanation:

a. You can use linear pair theorem. That is, two angles on a straight line are supplementary. They sum up to 180°

b. Thus:

x + (4x - 20) = 180°

x + 4x - 20 = 180

5x - 20 = 180

5x = 180 + 20

5x = 200

x = 200/5

x = 40