Question

How to solve this problem?

Answer 1

Because this is a parallelogram, both the bottom and top bases are equal.

2c - 6 = 20
add 6 to both sides

2c = 26
divide both sides by 2 to isolate the variable

c = 13

The interior angles are alternating interior angles.

4b = b + 120
subtract b from both sides

3b = 120
divide both sides by 3 to isolate the variable

b = 40