Question

ME AJUDEM A RESOLVER ESSE SISTEMA 2X+Y=6
XY=-20

Answer 1

2x+y=6  Y=6-2x
xy=-20

X(6-2x)=-20
6x-2x²=-20
-2x²+6x+20=0 

36+160

Δ=196

-6+-14/-4

X''=-6+14/-4 = 8/-4= -2

X''=-6-14/-4 = 5 

Y=6-2.5
Y=6-10
y=-4

X=5  Y=-4