Triangle ABC is congruent to triangle DFE. Find y.
12
13
12.5
13.5

Answer:
y = 12.5
Step-by-step explanation:
substitute the numbers one by one into
2y + 20
only when y = 12.5 does the sum corresponds to one of the angles on the left triangle, which is
2(12.5) + 20 = 45