Question

$x = 3y - 1 \\ \\ 2x + y = 12$
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Answer 1

Resposta:

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

Explicação passo-a-passo:

$\left \{ {{x=3y-1} \atop {2x+y=12}} \right. \\2(3y-1)+y=12\\y=2\\x3.2-1\\x=5\\(x,y)=(5,2)\\\left \{ {{5=3.2-1} \atop {5.3.2=12}} \right. \\\left \{ {{5=5} \atop {12=12}} \right. \\(x,y)=(5,2)$