{x+y=9
{y^2+x=29
x=9-y
y^2+(9-y)-29=0
y^2+9-y-29=0
y^2-y-20=0
D=1-4*1*(-20)=81
y1=1+9/2*1=5
y2=1-9=2=-4
x1=9-5=4
x2=9-(-4)=13.
{x+y=9
{y^2+x=29
x=9-y
y^2+(9-y)-29=0
y^2+9-y-29=0
y^2-y-20=0
D=1-4*1*(-20)=81
y1=1+9/2*1=5
y2=1-9=2=-4
x1=9-5=4
x2=9-(-4)=13.