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grade nine math

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is the answer to my equation right?
equation: 5(3r-7)+r=3(r-3)
15r-35+r=3r-9
15r+r-3r=-35-9
13r/13 = -44/13

  • grade nine math -

    no. the third line should read
    15r+r-3r=35-9

  • grade nine math -

    from the 2nd line, when -35 is transposed to other side,
    15r - 35 + r = 3r - 9
    15r + r - 3r = 35 - 9
    ...it must be positive 35. you forgot to change its sign.

  • grade nine math -

    Oh so you are saying that the 35 should be a positive instead of a negative. Is that correct!!So the answer for r is 2. Thanks I think I get it.

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