Answer:
She is not correct
x = -9
Explanation:
The sum of interior angles in a triangle is equal to 180° therefore if you add all three angles in this triangle it must add up to 180°
50 - 5x + 5 - 4x + 17 - 3x = 180 add/subtract the like terms
72 - 12x = 180
- 12x = 108 divide both sides by 12
-x = 9
x = -9