Answer:
x = 13
Step-by-step explanation:
You should note that any straight angle like those = 180° where they provided supplementary angles where the sum = 180°
(11x - 15) + (5x - 13) = 180°
Combine like terms:
16x - 28 = 180°
Add 28 on both sides:
16x = 208
Divide 16 on both sides:
x = 13
