- Here, the two angles are equal.
- So, it is an isosceles triangle.
- So, the two opposite sides to the equal angles will be equal.
- Therefore, XY = YZ
- Therefore, YZ = 4x + 3 = 4(3) + 3 = 12 + 3 = 15
Hope you could get an idea from here.
Doubt clarification - use comment section.