Respuesta :

2x + y = 0
2x + 3 = 0
      - 3  - 3
      2x = -3
       2      2
         x = -1¹/₂
(x, y) = (-1¹/₂, 3)
we have
equation 1   [tex]2x+y=0[/tex]

equation 2  [tex]y=3[/tex]

substitute the equation 2 in equation 1
[tex]2x+[3]=0 \\ 2x=-3 \\ x=- \frac{3}{2} [/tex]

the solution is the point
[tex](- \frac{3}{2} ,3)[/tex]

using a graph tool
see the attached figure

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