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Anonymous
Anonymous asked in Science & MathematicsMathematics · 10 years ago

Solve for r r/5+6/5=r/7=8/7?

solve for r

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  • 10 years ago
    Favorite Answer

    r/5 + 6/5 = r/7 + 8/7

    7r + 42 = 5r + 40

    2r = - 2

    r = - 1

    Answer: r = - 1

    Checking:

    - 1/5 + 6/5 = - 1/7 + 8/7

    5/5 = 7/7

    1 = 1

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  • 10 years ago

    (r/5-r/7)=(8/7-6/5) multiply by 35

    7r-5r=40-42

    2r=-2

    r=-1

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