Question

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

Answers

  1. 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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