Algebra

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I am having trouble with two problems. I can't seem to get a solid solution to either one of them.

3/y+5 + 6/7y add and simplify

5-r/8-r = 3/r-8 solve

Can someone help me please? Thanks so much.

  • Algebra -

    3/y+5 + 6/7y add and simplify

    Perhaps you mean
    3/(y+5) + 6/7y
    multiply top and bottom of both by
    (7y)(y+5)

    3(7y)/[7y(y+5)] + 6(y+5)/[7y(y+5)]

    [21y + 6y +30]/[7y^2+35y]

    [27y+30]/[7y^2+35y]
    =========================
    5-r/8-r = 3/r-8 solve
    parentheses as follows?
    (5-r)/(8-r) = -3/(8-r)
    multiply both sides by (8-r)
    5-r = -3
    r = 8

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