Question

Qual a resposta do sistema:
-x + 2y = -3
5x - 2y = -1

Answer 1

{-x+2y=-3
{5x-2y=-1
4x=-4
x=-4/4
x=-1
5x-2y=-1
5.(-1)-2y=-1
-5-2y=-1
-2y=-1+5
-2y=4.(-1)
2y=-4
y=-4/2
y=-2
-x+2y=-3
-x+2.(-2)=-3
-x-4=-3
-x=-3+4
-x=1.(-1)
x=-1
S={(-1, -2)}

Answer 2

Soma as duas equações
4x = -4
x = -4 / 4
x = -1

-(-1) + 2y = -3
1 + 2y = -3
2y = -3 -1
y = -4 / 2
y = -2