Answer: x = 7
Explanation:
The right angle is equal to 90 degrees
Therefore (5x - 8) + (4x + 35) is equal to 90 degrees
5x - 8 + 4x + 35 = 90
5x + 4x + 35 - 8 = 90
9x + 27 = 90
- 27 -27 (subtract 27 from both sides)
9x = 90 - 27
9x/9 = 63/9 (divide both sides by 9)
x = 7
Check
5(7) - 8 + 4(7) + 35 = 90
35 - 8 + 28 + 35 = 90