Question

Resolva os sistemas abaixo -2x+5y=3 -2x+y=-1

Answer 1

$\left \{ {{-2x+5y=3}*(1) \atop {-2x+y=-1*(-5)}} \right. \\ \left \{ {{-2x+5y=3} \atop {10x-5y=-5}} \right. \\ \\ \left \{ {{-2x =3} \atop {10x=-5}} \right. \\ \\ 8x =-2\right. \\ x=- \frac{2}{8} =- \frac{1}{4} agora achar y \\ substituindo x na equacao I$

-2*(-1/4)+5y=3
1/2+5y=3
5y=3+1/2
5y=7/2
y=7/10