Answer:
its 50.
Step-by-step explanation:
hope you pass :)
sorry i need more points
a is the answer
i got it right
(x-y) (a+x-y)
(y-x)=-(x-y)
-a(y-x) = a(x-y)
(x-y)^2 = (x-y)(x-y)
(x-y)(a + x - y)