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Math Help - graphing linear equation, need help.

  1. #1
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    graphing linear equation, need help.

    -x+4y=9

    what's the best number to put for X

    any suggestion?
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  2. #2
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    Quote Originally Posted by jingming90 View Post
    -x+4y=9

    what's the best number to put for X

    any suggestion?
    x = 0 ... you get the y-intercept

    y = 0 ... you get the x-intercept
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  3. #3
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    y do i have to find the x and y intercept first? does it make it easier?
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  4. #4
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    Quote Originally Posted by jingming90 View Post
    y do i have to find the x and y intercept first? does it make it easier?
    you asked for a suggestion ... I gave you one.

    you'll have to determine if it makes graphing the line "easier" than some other method you know.
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  5. #5
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    Quote Originally Posted by jingming90 View Post
    y do i have to find the x and y intercept first? does it make it easier?

    I think so, you have a point on the x-axis and a point on the y-axis, just join the 2 and you have a line.

    As both calcs have a zero, the calclations are simple.
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  6. #6
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    what should i do if the equation look somthing like -2x=4y
    ??
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  7. #7
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    Quote Originally Posted by jingming90 View Post
    what should i do if the equation look somthing like -2x=4y
    ??
    If the line passes through (0, 0) then you need to get another point. Common sense would suggest that you should substitute a simple value of x to get that point eg. x = 1 => y = -1/2 so that (1, -1/2) is a point.
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