{y=6-2x {3x^2-y^2=8 3x^2-(6-2x)^2=8 3x^2-(36-24x+4x^2)=8 3x^2-36+24x-4x^2-8=0 -x^2+24x-44=0 x^2-24x+44=0 D=576-176=400 x1=24-20/2=2 x2=24+20/2=22