2x+y=1 y=1-2x x^2-11x+14=2y x^2-11x+14=2(1-2x) x^2-11x+4x+14-2=0 x^2-7x+12=0 d=49-48=1 vd=1 x1=7-1/2=3 x2=7+1/2=4 y1=1-2*3=-5 y2=1-2*4=-7 x1=3 y1=-5 x2=4 y2=-7