Question

Calcule o sistema
5x+y=-1
3×+4x=13

Answer 1

$5x + y = - 1 \: \: \: \: ( \times - 4)\\ 3x + 4y = 13 \\ \\ - 20x - 4y = 4 \\ 3x + 4y = 13 \\ \\ - 17x = 17 \\ 17x = - 17 \\ x = \frac{ - 17}{17} \\ x = - 1 \\ \\ 5( - 1) + y = - 1 \\ - 5 + y = - 1 \\ y = - 1 + 5 \\ y = 4$

Resposta final: x = -1 , y = 4