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  • Dec 24, 2006, 12:11 PM
    kel214
    linear equations
    I need to solve for y. How do I go about finding the answer to this problem. 2y+5x=7
  • Dec 24, 2006, 06:32 PM
    Fianchetto
    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:)
  • Dec 25, 2006, 04:25 PM
    galactus
    1 Attachment(s)


    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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