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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
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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

User Jacob Hyde
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-x - 3y = -12
-x = 3y - 12..multiply by -1 to make x positive
x = -3y + 12
so u would sub in -3y + 12 for x in the first equation
User Camelle
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