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y=-2x+2, 7x+4y=7

  • math -

    2x+y=2 or 8x+4y=8
    7x+4y=7. Subtracting one eq from other, we get x=1. Substituting this in given eq, 2x1+y=2 or y=0.
    Check:0=-2x1+2 ok,
    7x1+4x0=7 ok.

  • math -

    ideal setup for "substitution"

    1st into 2nd:
    7x + 4(-2x+2) = 7
    7x + 8x + 8= 7

    -x = -1
    x = 1
    plug that back into 1st, all done

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