Answer:
BC = 20
Explanation:
If all angles are the same then all the sides are the same; therefore, BC = AC.
Set up the equations to solve for y
-y + 23 = 6y + 2; add y to both sides
23 = 7y + 2; subtract 2 from both sides
21 = 7y; divide by 7
y = 3; now use this to substitute into term for BC = 6y + 2 = 6(3) + 2 = 18+2 = 20