# math

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

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1. 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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posted by drwls

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