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    garden100's Avatar
    garden100 Posts: 1, Reputation: 1
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    #1

    Aug 15, 2009, 01:34 AM
    linear equations
    hi
    please can you help me by showing me in detail how to solve a linear equation with 2 variables

    as example 6x + 3y = 81
    many thanks john
    ROLCAM's Avatar
    ROLCAM Posts: 1,420, Reputation: 23
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    #2

    Aug 15, 2009, 04:21 AM

    To solve linear equations of two variables
    you must have two linear equations.
    To solve linear equations of three variables you must have three linear equations.
    I shall be more than happy to teach you how to solve these.
    Email me :- [email protected]
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Aug 15, 2009, 05:55 AM
    You can not 'solve' an equation with two variables because it has infinite solutions for x and y that will satisfy it. But, if you just want to solve for x or y, then you're in luck.

    What you have is the standard form equation of a line. To get it into slope intercept form, solve for y.

    First, divide by 3:

    Now, just subtract 2x from both sides:

    This is a line with slope -2 and crosses the y-axis at 27.
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