Question

5x-y=4

2x-y=-5

Matemática

Answer 1

Resposta:

X= 3

Y= 11

Explicação passo-a-passo:

$\left \{ {{5x-y=4} \atop {2x-y=-5}} \right. \\\left \{ {{5x-y=4} \atop {2x-y=-5 [*(-1)]}} \right. \\\left \{ {{5x-y=4} \atop {-2x+y=5}} \right. \\\\3x=9\\x=3\\\\5x-y=4\\5*3-y=4\\15-y=4\\-y=4-15\\-y=-11 \\y=11$