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Math Help - Equations

  1. #1
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    Apr 2005
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    Equations

    I'm having major problems trying to evaluate this:

    If 2x -3 =7, evaluate 3x + 4.

    Jodie
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  2. #2
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    Quote Originally Posted by jodiet50
    I'm having major problems trying to evaluate this:

    If 2x -3 =7, evaluate 3x + 4.

    Jodie
    Ok first thing you need to do is solve for x

    1) move the -3 to the other side of the equation:

    2x = 7 +3 => 2x =10

    2) Solve for x by dividing both sides of the equation by 2

    x = 5


    Now tha you know that x=5 you can plug it into the second equation:

    3x+4 => 3(5) +4 => 15 +4 => 19

    Hope this helps
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  3. #3
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    Smile Equations

    Thank you so much Nicole.

    jodie
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