2x=y=7 y=7-2x y=7-2x
{ { {
x^2-y=1 x^2-(7-2x)=1 x^2+2x-8=0
x^2+2x-8=0
D=4+32=36
x1=-4
x2=2
__
| x=-4 x=-4
| { {
| y=7-2x y=-1
|
| x=2 x=2
|__ y=7-2x y=3
2x=y=7 y=7-2x y=7-2x
{ { {
x^2-y=1 x^2-(7-2x)=1 x^2+2x-8=0
x^2+2x-8=0
D=4+32=36
x1=-4
x2=2
__
| x=-4 x=-4
| { {
| y=7-2x y=-1
|
| x=2 x=2
| { {
|__ y=7-2x y=3