Answer:
x = 30
Step-by-step explanation:
5x and 3x + 60 are co-exterior angles. To make A and B parallel, they should congruent (equal}
5x = 3x + 60
5x - 3x = 60
2x = 60
x = 60/2
Checking:
5x = 5*30 = 150
3x + 60 = 3*30 + 60 = 90 + 60 = 150
