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    kel214's Avatar
    kel214 Posts: 1, Reputation: 1
    New Member
     
    #1

    Dec 24, 2006, 12:11 PM
    linear equations
    I need to solve for y. How do I go about finding the answer to this problem. 2y+5x=7
    Fianchetto's Avatar
    Fianchetto Posts: 70, Reputation: 2
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    #2

    Dec 24, 2006, 06:32 PM
    Quote Originally Posted by kel214
    I need to solve for y. How do I go about finding the answer to this problem. 2y+5x=7
    The result will have the form : y=mx+b

    or, more specifically, 1y+0 =mx+b

    The rule is that since it's an equality, the same operations must be performed Both sides of the "=".

    Figure out how to make the +5x=0 and do it to both sides.
    Figure out how to make the 2=1 and do that to both sides.


    I hope I'm not too ambiguous, but reply and I'll try to show you the general case.

    Fianchetto:)
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Dec 25, 2006, 04:25 PM


    Subtract 5x from both sides:



    Divide by 2:



    Now, in slope-intercept form:



    7/2 is where it crosses the y-axis and 5/2 is the slope.
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