Respuesta :

Answer: A

Step-by-step explanation:

The easiest method to solve this system of equations would be to use substitution method because y is already solved for.

[tex]-4x+6(-2x+21)=-18[/tex]                 [distribute]

[tex]-4x-12x+126=-18[/tex]                     [combine like terms]

[tex]-16x+126=-18[/tex]                             [subtract both sides by 126]

[tex]-16x=-144[/tex]                                     [divide both sides by -16]

[tex]x=9[/tex]

Now, we plug x into the second equation to get y.

[tex]y=-2(9)+21[/tex]                                  [multiply]

[tex]y=-18+21[/tex]                                     [combine like terms]

[tex]y=3[/tex]

Putting (x,y), we get (9,3).

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