Question

1.) x = __________

Explanation:

Step1: Identify angle - relationship

Assume lines m and n are parallel. The 120 - degree angle and the 3x - degree angle are corresponding angles (if m || n), and corresponding angles are equal when two parallel lines are cut by a transversal. So we set up the equation 3x=120.

Step2: Solve the equation

Divide both sides of the equation 3x = 120 by 3. We get $x=\frac{120}{3}$.

Answer:

40