Respuesta :
from second equation y = -2-x
Plug this into the first equation:-
- 2 - x = -x^2 - x + 2
x^2 + x - 2 - 2 - x = 0
x^2 - 4 = 0
x^2 = 4
x + +/- 2
Plug these values into x + y = -2 :-
x = 2:-
2 + y = -2
so y = -4
so one solution is (2,-4)
Now try x = -2
- 2 + y = -2
y = 0
so the second solution is ( -2 , 0)
So A and C are correct
Plug this into the first equation:-
- 2 - x = -x^2 - x + 2
x^2 + x - 2 - 2 - x = 0
x^2 - 4 = 0
x^2 = 4
x + +/- 2
Plug these values into x + y = -2 :-
x = 2:-
2 + y = -2
so y = -4
so one solution is (2,-4)
Now try x = -2
- 2 + y = -2
y = 0
so the second solution is ( -2 , 0)
So A and C are correct