Answer:
Step-by-step explanation:
7. x + 78 = 70
x = -8
corresponding angles
8. 13x = 5 + 12x
x = 5
alt. ext. angles
9. 56x - 2 = 110
56x = 112
x = 2
vertical angles
10. 26x + 5 = 135
26x = 130
alt. int. angles
11. x + 110 = 100
x = -10
12. 12x + 4 = 13x - 4
-x = -8
x = 8
