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Algebra math.

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1) the sum of the digits of a two digit number is 9. The value of the number is 12 times the tens digit. Find the number.

2) the sum of the digits of a two digit number is 12. If 15 is added to the number the result is 6times the units digit. Find the number.

Please help!!

Thanks (:

  • Algebra math. - ,

    let the unit digit by x
    let the tens digit be y
    so x+y=9, both x and y being whole numbers

    value of number = 10y+x

    given: 10y+x = 12y
    or x = 2y
    back in the first:
    x+y=9
    2y+y=9
    y=3, and thus x = 6
    the number is 36

    let's see you do the second question in the same way.

  • Algebra math. - ,

    Thanks ! This really helped (:

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