algebra

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I'm having difficulty solving 0.7y+9=y+15?????
I know the answer is 20 but can't remember procedure.
Do I change the decimal to a fraction 1st???

  • algebra -

    getting rid of decimals and fractions is usually a good first step. In this case, we get

    7y + 90 = 10y + 150
    -3y = 60
    y = -20

    it could have been done without that. the procedure is to collect all the y's on one side, and the numbers on the other

    .7y - y = 15 - 9
    -.3y = 6
    y = 6/-.3
    y = -20

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