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Math Help - Simple Equation confusion

  1. #1
    Newbie
    Joined
    Feb 2011
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    Unhappy Simple Equation confusion

    Hey guys;

    I'm new to the forum so hello from me. I'm currently practicing simple linear-equations and feel comfortable with one and two-step equations.

    However I've come across a slight obstacle with equations represented as thus;

    17-y
    _____ = 4.5
    3

    With this equation do I turn the denominator (3) across to 4.5 x (3) to make 13.5.

    17-y = 13.5

    The next step is where i become confused. I google-answered this example and the steps are;

    17-y = 13.5
    -y = -3.5
    y= 3.5

    How do i get 3.5? I've tried dividing 13.5 into 17 which is obviously wrong. Would be very grateful if someone could explain this to me.

    thanks
    J
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  2. #2
    MHF Contributor
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    Mar 2010
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    Florida
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    Quote Originally Posted by johnnerz View Post
    Hey guys;

    I'm new to the forum so hello from me. I'm currently practicing simple linear-equations and feel comfortable with one and two-step equations.

    However I've come across a slight obstacle with equations represented as thus;

    17-y
    _____ = 4.5
    3

    With this equation do I turn the denominator (3) across to 4.5 x (3) to make 13.5.

    17-y = 13.5

    The next step is where i become confused. I google-answered this example and the steps are;

    17-y = 13.5
    -y = -3.5
    y= 3.5

    How do i get 3.5? I've tried dividing 13.5 into 17 which is obviously wrong. Would be very grateful if someone could explain this to me.

    thanks
    J
    13.5-17 = -3.5

    -1 * -3.5 = 3.5

    -1 * -y = y

    y = 3.5
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  3. #3
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    Feb 2011
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    thanks DW

    Would i be correct then for this second example?

    12-y
    ____ = 5
    3

    5*3 = 15
    15-12 = 3
    -y = 3
    y= - 3
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  4. #4
    MHF Contributor
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    Quote Originally Posted by johnnerz View Post
    thanks DW

    Would i be correct then for this second example?

    12-y
    ____ = 5
    3

    5*3 = 15
    15-12 = 3
    -y = 3
    y= - 3
    Correct.
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  5. #5
    Newbie
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    Feb 2011
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    awesome, thanks for your help, I really appreciate it
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