Question

How do I start the equation?

Answer 1

Explanation:

Well they add up to a straight line which would be 180 degrees. That means 40, 6x+2 and 90 all add up to 180

40 + 90 + 6x + 2 = 180

Answer 2

x = 8

Explanation:

40 + 6x + 2 = 90° because these angles are complementary

6x = 90 - 42

6x = 48 divide both sides by 6

x = 8