Two adjacent angles have a sum of 100°. The angles have measures ∠1 = 20° and ∠2 = (3x + 15)°. What equation can be used to solve for x?
A) 3x + 115 = 20
B) 3x − 20 = 100
C) 3x − 100 = 20
D) 3x + 35 = 100
The equation that can be used to solve for x is:
∠1 + ∠2 = 100
20° + (3x + 15)° = 100
Simplifying, we get:
3x + 35 = 100
Therefore, the correct equation is:
D) 3x + 35 = 100