Question

Sisteme de doua ecuații de gradul 1 cu doua necunoscute.

Answer 1

$\left \{ {{2x+y=-1} \atop {6x+4y=0}} \right. = >$$\left \{ {{y=-1-2x} \atop {6x+4y=0}} \right.$$= > \left \{ {{y=-1-2x} \atop {6x+4*(-1-2x)=0}} \right. = >$$\left \{ {{y=-1-2x} \atop {6x-4-8x=0}} \right. = > \left \{ {{y=-1-2x} \atop {-2x-4=0}} \right. = > \left \{ {{y=-1-2x} \atop {-2x=4}} \right. = > \left \{ {{y=-1-2x} \atop {x=-2}} \right. = > \left \{ {{2*-2+y=-1} \atop {x=-2}} \right. = > \left \{ {{-4+y=-1} \atop {x=-2}} \right. = > \left \{ {{y=3} \atop {x=-2}} \right.$