Question

determine o valor da solução do sistema { 2x + y = 0
{ 2x - y = 4

Answer 1

{ 2x + y = 0
{ 2x - y = 4 +
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
4x = 4
x = 4/4
x = 1

2x + y = 0
y = - 2x
y = - 2.1
y = - 2

S = {1, - 2}

Answer 2

2x+y=0 ----->>> y=-2x
2x-y=4
2x-(-2x) = 4
2x+2x=4
4x=4
x=4/4
x=1

y= -2x
y= -2.1
y= -2

s= (1,-2)