Question

Solve for x in the diagram below.

Answer 1

x=40

Explanation:

It is a straight line, and we know that angles on a straight line are supplementary, or add to 180 degrees.

So, all the angles added together must equal 180 degrees

100+x+x=180

Combine like terms

100+2x=180

Subtract 100 from both sides

2x=80

Divide by 2 on both sides

x=40

Hope this helps! :)

Answer 2

x + x + 100 = 180

2x + 100 = 180

2x = 80

x = 40

Explanation: