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For the following system, if you isolated x in the second equation to use the substitution method, what expression would you substitute into the first equation?
2x+y=8
-x-3y=-12

Respuesta :

Answer:

x = 12 - 3y

Step-by-step explanation:

- x - 3y = - 12 ( multiply through by - 1 )

x + 3y = 12 ( subtract 3y from both sides )

x = 12 - 3y

then substitute x = 12 - 3y into the first equation

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