Answer:
x = 9
Step-by-step explanation:
The alternate interior angles theorem tells us that these two quantities must be the same.
Therefore,
x + 18 = 4x - 9
x + 18 + 9 = 4x
x + 27 = 4x
27 = 4x - x
27 = 3x
x = 9
---
Hey, hope this helped! If you want to say thank you, click the "Thanks" button and select the answer "The Brainliest!" - I appreciate it!
