Question

If x2 - y2 = 55, and x - y = 11, then y =
[a] 8
[b] 5
[c] -3
[d] -8

Answer 1

Answer:

correct answer is c(-3)

Answer 2

Answer:

(-3)

Step-by-step explanation:

x2 - y2 = (x + y)(x - y)

55 = (x + y)11

x + y = 5

x = 5 - y

and.. according to question

x - y =11

x = 11 + y

:. 11 + y = 5 - y

6 = (-2y)

y = -3