Question

x²-y²=8
x-y= 2
From the equation above what is the value of x²+y²?
A. 25
B. 19
C. 13
D. 10
E. 4

Answer 1

(x-y)(x+y) = 8

(x+y) = 4
(x-y) = 2
+
2x = 6
x =3
y=1

x^2 + y^2 = 9+1 =10

i hope this will help u