Question

X^2+y^2=13 and x-y=5 solve

Answer 1

(x + y)² = 5²

x² + y² + 2xy = 25

13 + 2xy = 25

2xy = 25 - 13

2xy = 12

xy = 12 / 2 = 6

$\mathtt{Hope \: it \: helps}$