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Podemos multiplicar por -1 la segunda ecuación:
2y = 7 -x → 2y +x = 7
2y = -6x -8 → 2y +6x = -8 (-1) → -2y -6x = 8
2y +x = 7
-2y -6x = 8
// -5x = 15
x = 15/-5
x = -3
Remplazamos el valor de "x" en cualquiera de las dos ecuaciones
2y = -6x -8
2y = -6 (-3) -8
2y = 18 -8
2y = 10
y = 10/2
y = 5