math
posted by will on .
I need help with 4 mat problems. I do not know how to set up to solve.
x/8=6
4/9+(5/7)
x4/5=6/7
7/x=?/xsquared

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(x4) = 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