Question

Look at the diagram.

Which equation can be used to solve for x?

3(5x) = 60

3(5x) + 60 = 90

3(5 + x) = 60

3(5 + x) + 60 = 180

Answer 1

3(5+x) = 60

Explanation:

The angle 60 and the angle 3(5+x) are vertical angles. We know that vertical angles are equal.

3(5+x) = 60