Question

Qual e o resultado de
-x+2y=4
E de
X+3y=1

Answer 1

$\left \{ {{-x+2y=4} \atop {x+3y=1}} \right. <=> \left \{ {{-(1-3y)+2y=4} \atop {x=1-3y}} \right. <=> \left \{ {{-1+5y=4} \atop {---}} \right. <=> \left \{ {{y=5/5} \atop {---}} \right.$<=>
<=> $\left \{ {{y=1} \atop {-2}} \right.$