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Math Help - draw

  1. #1
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    draw

    hi i need to know how to draw, Y=3x-1 on a graph!
    im not too sure but would it look like this:
    draw-graph.jpg

    if not could you please point my in the right direction! but if it is correct could you also let me know!

    thanks!
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by andyboy179 View Post
    hi i need to know how to draw, Y=3x-1 on a graph!
    im not too sure but would it look like this:
    Click image for larger version. 

Name:	graph.jpg 
Views:	12 
Size:	14.5 KB 
ID:	19818

    if not could you please point my in the right direction! but if it is correct could you also let me know!

    thanks!
    You're rather close with your graph...however, the line you drew has slope m=\frac{1}{3}.

    To get the correct graph, start with the point (0,-1) [the y intercept]. Now since the slope of the line is m=\dfrac{\text{rise}}{\text{run}}=\dfrac{3}{1}, go up 3 units from the y intercept, and then move 1 unit to the right to get the next point (1,2). Then connect the two points and that's your line.

    Does this make sense?
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  3. #3
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    so it would be:
    draw-graph.jpg
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  4. #4
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by andyboy179 View Post
    so it would be:
    Click image for larger version. 

Name:	graph.jpg 
Views:	9 
Size:	13.5 KB 
ID:	19819
    Good job.
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  5. #5
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    what if the question was 2x=y=7 would it look like this:
    draw-graph.jpg
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  6. #6
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by andyboy179 View Post
    what if the question was 2x=y=7 would it look like this:
    Click image for larger version. 

Name:	graph.jpg 
Views:	5 
Size:	15.2 KB 
ID:	19820
    Do you mean 2x+y=7? If so, you're close...your x intercept isn't correct, but it has the right orientation.

    So...to get the correct x intercept, what is the value of x in the equation if y=0?




    Also, in the future, please make new threads for new questions -- it makes it easier for the other users to follow what's going on.
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  7. #7
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    ok sorry!

    would i be:
    draw-graph.jpg
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