Question

If x² - y² = 55, and x - y = 11, then y =

A. 8
B. 5
C. 3
D. -8
E. -3

Answer 1

If x-y = 11
then y = x-11
x²-(x-11)² =55
x²-(x²-22x+121) = 55
22x - 121 = 55
22x = 176
x =8
 y = x-11
y = 8-11
 y = -3. 
e is right option 
hope this helps