Question

$x {}^{2} + y {}^{2} - 2xy = 16 \\ x + 2y = - 2$
tenglamar sistemasini yeching ​

Answer 1

1) x^2 - 2xy + y ^2 = 16
(x - y)^2 = 16
(x-y)^2 = 4^2
x-y = 4 or x-y = 4

2) x + 2y = -2
x + 2y + 2 = 0
x + 2(y + 1) =0
x + y + 1 = 0
x + y = - 1