Resposta:
x = 4;
y = 2;
Explicação passo-a-passo:
5x - 8y = 4
4 + 8y = 5x
-5x + 10y = 0
-(4 + 8y) + 10y = 0
-4 -8y + 10y = 0
-4 + 2y = 0
2y = 0 + 4
2y = 4
y = 4/2
y = 2
4 + (8 × 2) = 5x
4 + 16 = 5x
20 = 5x
x = 20/5
x = 4
