1) y=-x^2+4 y=-x^2+4 y^2-8y+12=0 y1=6 y2=2
x+y=4 x=4-y x=4-y x1=-2 x2=2
2) y=x^2+1 y=x^2+1 y1=5 y2=2.96
5x+3y=25 5x+3(x^2+1)+1=25 x1=2 x2=-1.4
1) y=-x^2+4 y=-x^2+4 y^2-8y+12=0 y1=6 y2=2
x+y=4 x=4-y x=4-y x1=-2 x2=2
2) y=x^2+1 y=x^2+1 y1=5 y2=2.96
5x+3y=25 5x+3(x^2+1)+1=25 x1=2 x2=-1.4