math

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I need help with 4 mat problems. I do not know how to set up to solve.

x/8=-6

-4/9+(-5/7)

x-4/5=6/7

7/x=?/xsquared

  • math -

    1.Multiply both sides of the first equation by 8
    2. convert each fraction to have a (common) denomiator of 63. Then add the numerators
    3. Multiply both sides of the equation by 35 and yet 7(x-4) = 30
    Then solve that.
    4. I assume you mean (7/x) = y/x^2
    where y is a new unknown that you indicate by ?
    xy = 7x^2
    y = 7x

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