Respuesta :
x + y = 8
2x^2 - y = -5
+_________
2x^2 + x = 3
2x^2 + x -3 = 0
(2x + 3)(x - 1) = 0
x = -3/2, x = 1
2x^2 - y = -5
+_________
2x^2 + x = 3
2x^2 + x -3 = 0
(2x + 3)(x - 1) = 0
x = -3/2, x = 1