Question

помогите решить$left { {{x-3y=2} atop {xy+y=6}} right.$

Answer 1

{x-3y=2⇒x=3y+2
{y(x+1)=6
y(3y+2+1)=6
3y²+3y-6=0
y²+y-2=0
y1+y2=-1 U y1*y2=-2
y1=-2⇒x1=-2*3+2=-4
y2=1⇒x2=3*1+2=5
(-4;-2);(5;1)