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    dreams2big2keep's Avatar
    dreams2big2keep Posts: 2, Reputation: 1
    New Member
     
    #1

    May 5, 2008, 10:30 PM
    How do you solve/graph this. ABSOLUTE VALUE?
    Absolute value??

    y= -lx+2l+3

    how do I graph it?? Please help?
    iamthetman's Avatar
    iamthetman Posts: 105, Reputation: 8
    Junior Member
     
    #2

    May 6, 2008, 07:38 AM
    Plot the points on a graph.
    x=3 -> y=-2
    x=2 -> y=-1
    x=1 -> y=0
    x=0 -> y=1
    x=-1 -> y=2
    x=-2 -> y=3
    x=-3 -> y=4

    You'll notice that you have a straight line!
    retsoksirhc's Avatar
    retsoksirhc Posts: 912, Reputation: 71
    Senior Member
     
    #3

    May 6, 2008, 07:44 AM
    Quote Originally Posted by iamthetman
    Plot the points on a graph.
    x=3 -> y=-2
    x=2 -> y=-1
    x=1 -> y=0
    x=0 -> y=1
    x=-1 -> y=2
    x=-2 -> y=3
    x=-3 -> y=4

    You'll notice that you have a straight line!
    I disagree...

    Following the equation y= -lx+2l+3

    For x=-3, y= -|-3+2| +3
    y=-|-1|+3
    y=-1+3
    y=2

    Absolute values make a V shaped graph.
    iamthetman's Avatar
    iamthetman Posts: 105, Reputation: 8
    Junior Member
     
    #4

    May 6, 2008, 08:02 AM
    So essentially what you have is this:
    x=3 -> y=-2
    x=2 -> y=-1
    x=1 -> y=0
    x=0 -> y=1
    x=-1 -> y=2
    x=-2 -> y=3
    but then when you get to x=-3 you notice a change:
    x=-3 -> y=2
    x=-4 -> y=1
    x=-5 -> y=0
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #5

    May 6, 2008, 12:29 PM
    Here's the graph:
    Attached Images
     
    retsoksirhc's Avatar
    retsoksirhc Posts: 912, Reputation: 71
    Senior Member
     
    #6

    May 6, 2008, 01:08 PM
    Nice, galactus. What did you use to make that? It's pretty spiffy.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #7

    May 6, 2008, 02:42 PM
    I done that with a FREE graphing download you can get at Graph

    Download it. It's absolutely free. It graphs standard, parametric, and polar. As well as finding area, finding tangent lines, etc.
    noor 123's Avatar
    noor 123 Posts: 1, Reputation: 1
    New Member
     
    #8

    Feb 1, 2010, 04:31 AM
    x -1 0 1
    Y=3x+5

    plot the points and draw a straight line through the ponts.
    from the graph,find:-
    the values of y when x=2,0.6 and 1.5
    the values of x when y=1,0.8 and 2.9

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