Question

3x+y=13..........
2x-y=12............​

Answer 1

Resposta:

(x,y)=(5,-2)

Explicação passo-a-passo:

$\left \{ {{y=13-3x} \atop {2x-y=12}} \right. \\\\2x-(13-3x)=12\\x=5\\y=13-3.5\\y=-2\\(x,y)=(5,-2)\\\left \{ {{3.5-2=13} \atop {2.5-(-2)=12}} \right. \\\left \{ {{13=13} \atop {12=12}} \right. \\(x,y)=(5,-2)$

Espero ter ajudado!!