Respuesta:
x + y = 8
y = 8 - x
5x + 3y = 28
5x + 3(8 - x) = 28
5x +24 - 3x = 28
2x = 28 - 24
2x = 4
x = 4/2
x = 2
y = 8 - 2
y = 6
Comprobacion:
2 + 6 = 8
8 = 8
5(2) + 3(6) = 28
10 + 18 = 28
28 = 28
