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View Full Version : How do you solve/graph this. ABSOLUTE VALUE?


dreams2big2keep
May 5, 2008, 10:30 PM
Absolute value??

y= -lx+2l+3

how do I graph it?? Please help?

iamthetman
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
May 6, 2008, 07:44 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!
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
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
May 6, 2008, 12:29 PM
Here's the graph:

retsoksirhc
May 6, 2008, 01:08 PM
Nice, galactus. What did you use to make that? It's pretty spiffy.

galactus
May 6, 2008, 02:42 PM
I done that with a FREE graphing download you can get at Graph (http://www.padowan.dk)

Download it. It's absolutely free. It graphs standard, parametric, and polar. As well as finding area, finding tangent lines, etc.

noor 123
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