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2x -y = 4
Multiplicamos por -2 la 1era ecuación:
x + y = 5 (-2)
-2x -2y = -10
Ahora reducimos:
-2x -2y = -10
2x - y = 4
-----------------------
// -3y = -6
y = -6/-3
y = 2
Ahora remplazamos "y" en la 2da ecuación:
2x -y = 4
2x - (2) = 4
2x -2 = 4
2x = 4 +2
2x = 6
x = 6/2
x = 3
Respuesta:
y = 2
x = 3