Question

$x + 6y = 3 \\ x - y = 9$
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Answer 1

Resposta:

$x=\frac{21}{2}\\y=-\frac{6}{7}$

Explicação passo-a-passo:

$\left \{ {{x+6y=3} \atop {x-y=9*(-1)}} \right. \\\\\left \{ {{x+6y=3} \atop {-x+y=-9}} \right. \\7y=-6\\y=-\frac{6}{7}\\\\x- \frac{-6}{7} =9\\ \frac{6x}{7} =9\\\\6x=63\\x=\frac{63}{6} =\frac{21}{2}$