Answer:
AAS
Step-by-step explanation:
The first A:
∠ABC ≅ ∠DCB
The S:
CB ≅ BC
The second A:
∠A ≅ ∠D
All of them combined to prove ΔABC ≅ ΔDCB through ASA.
5x + 15 = -5x - 15
10x = -30
x = -3
y = 5(-3) + 15 = -15 + 15 = 0
(-3,0)
120 degrees
