Answer:
∠AXY = 56°
Explanation:
ΔYBZ is congruent to ΔABZ by the SAS postulate
∠AZB = ∠YZB because corresponding parts of congruent triangles are congruent.
Then:
5x + 3 = 2x + 18
combine like terms:
3x = 15
x = 5
∠AXY = 5(5) + 3 + 2(5) + 18 = 28 + 28 = 56°