Answer:
63 degrees.
Step-by-step explanation:
TRaingle ABC is isosceles so the base angles are equal That is < BAC = < BCA.
<BAC = 180 - 117 = 63 degrees ( because it is adjacent to <x which is 63 degrees).
So < BCA = <BAC = 63 degrees.
Finally y = 63 degrees ( vertical angles are equal).
