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math

posted by on .

solve by using subsitution:

4x+y=2
3y+2x=-1

  • math - ,

    from the first:
    y = 2-4x

    plug into the 2nd
    3(2-4x) + 2x = -1
    6 - 12x + 2x = -1
    -10x = -7
    x = 7/10
    then y = 2 - 4(7/10) = -4/5

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