Question

{2x - 3y = 13
{x+5y=-13
va rog imi traba pana 21​

Answer 1

Răspuns:

$\left \{ {{2x-3y=13} \atop x+5y=-13 | *(-2)}} \right. <=> \left \{ {{2x-3y=13} \atop {-2x-10y=26}} \right. =>(adunare ) / -13y=39 => y=-3\\\left \{ {{x+5*(-3)=-13} \atop {y=-3}} \right. <=> \left \{ {{x=-13+15} \atop {y=-3}} \right. <=> \left \{ {{x=2} \atop {y=-3}} \right. => S= { (2,-3) }$

Sper că te-am ajutat! ..