Answer:
x = 17, y = 25.5
Explanation:
Since ABC is congruent to DEF, we can say that angle A = D and B = E by CPCTC
So to find x we can do:
5x + 2 = 87
5x = 85
x=17
So x is 17
Since B = E and E is 42 degrees, then B must also be 42 degrees. So 87 , 42, and 2y must add up to 180 degrees because it is a triangle.
87 + 42 + 2y = 180 degrees
129 + 2y = 180
151 = 2y
y = 25.5
So x = 17 and y = 25.5