Answer:
C. 35
Step-by-step explanation:
Note:
∠3 = ∠7 because of corresponding angles.
So,
2x + 5 = 3x - 10
Solve for x algebraically:
2x + 5 = 3x - 10
5 = 3x - 2x - 10
5 = x - 10
5 + 10 = x
15 = x
Substitute x for ∠3:
2x + 5
2(15) + 5
30 + 5 = 35°
Now,
∠1 = ∠3 because of vertical angles.
So if ∠3 = 35°, then ∠1 = 35°
