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Math Help - Geometry: Plotting a line

  1. #1
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    Geometry: Plotting a line

    Maybe be a simple question for you but I'm new to this. I have to plot a line on a graph, It's fine when the line crosses over the x and y axis but after that is where I get stumped.

    2x + 5y = 8

    x axis -- y=0
    2x + 5(0) = 8
    2x + 0 = 8
    x = 4

    y axis -- x=0
    2(0) + 5y = 8
    0 + 5y = 8
    5y = 8
    y = 8/5

    Have I done that right and does that mean the points are x(0,4) y(8,5)
    Do I go up 8 on the y and come out 5 on the x?

    Thanks for any help.
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  2. #2
    MHF Contributor
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    Quote Originally Posted by zyx.gar View Post
    Maybe be a simple question for you but I'm new to this. I have to plot a line on a graph, It's fine when the line crosses over the x and y axis but after that is where I get stumped.

    2x + 5y = 8

    x axis -- y=0
    2x + 5(0) = 8
    2x + 0 = 8
    x = 4

    y axis -- x=0
    2(0) + 5y = 8
    0 + 5y = 8
    5y = 8
    y = 8/5 this is a fraction

    Have I done that right and does that mean the points are x(0,4) y(8,5)
    Do I go up 8 on the y and come out 5 on the x? you are just making things complicated for yourself

    Thanks for any help.
    HI

    This line will pass through these 2 points .. (4,0) and (0, 8/5)

    8/5 = 1.6

    Then ur job is simple , just get a ruler and a pensil to connect the 2 points .
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  3. #3
    Super Member
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    Jan 2009
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    Quote Originally Posted by zyx.gar View Post
    Maybe be a simple question for you but I'm new to this. I have to plot a line on a graph, It's fine when the line crosses over the x and y axis but after that is where I get stumped.

    2x + 5y = 8

    ALONG THE x axis --
    y=0 ... x = 4

    ALONG THE y axis --
    x=0 ... y = 8/5
    You have the right answers; your interpretation isn't.
    Plot the first point (4,0) on the x axis;
    plot the second point (0, 1.6) on the y axis;
    drawn the line connecting the two points & extend the line.
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  4. #4
    Senior Member pacman's Avatar
    Joined
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    equation: 2x + 5y = 8

    maybe THIS graph will help your cause . . . .


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