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6 January, 09:14

My teacher gave me a sheet of this and no instructions:

1. 5x+2y=10

-5x+7y=8

I don't know what I am suppose to do.

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Answers (1)
  1. 6 January, 09:33
    0
    Probably wants you to find what numbers will work for x and y in both equations

    add the two equations together

    5x-5x+2y+7y=10+8

    9y=18

    divide both sdies by 9

    y=2

    subsitute into first equation

    5x+2 (2) = 10

    5x+4=10

    subtract 4 from both sides

    5x=6

    divide both sdies by 5

    x=6/5

    so the asnwer is x=6/5 and y=2
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