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 This topic has been viewed 2069 times and has 5 replies
iantc39

Joined: Apr 7, 2012
Posts: 1
Status: Offline

 Graphing inequalities with 2 variables Reply to this Post Reply with Quote

Ok so a problem like -2x-2y>2
I can plug that into the graph on here, but how do i determine the coordinates to set the boundry line? It just graphs the equation and shades the area in, if I can't get the intercepts or 2 sets of cordinates how can I reproduce the graph?
 [Apr 7, 2012 3:18:15 PM] [Link]
pskinner

Joined: Apr 2, 2005
Posts: 797
Status: Offline
 Re: Graphing inequalities with 2 variables Reply to this Post Reply with Quote

 Ok so a problem like -2x-2y>2I can plug that into the graph on here, but how do i determine the coordinates to set the boundry line? It just graphs the equation and shades the area in, if I can't get the intercepts or 2 sets of cordinates how can I reproduce the graph?

Separately, you can plot -2x-2y=2 in the equation plotting calculator to "see" the boundary line. Pick the xmin and xmax and you will get a table of values to plot...be sure to include 0 between the xmin and xmax to get the y-intercept.
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Principal Skinner
 [Apr 7, 2012 10:40:26 PM] [Link]
JeremyStevens

United States
Joined: Apr 15, 2012
Posts: 2
Status: Offline
 Re: Graphing inequalities with 2 variables Reply to this Post Reply with Quote

Does xmin and xmax function gives exact result?
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 [Apr 16, 2012 3:47:05 AM] [Link]
pskinner

Joined: Apr 2, 2005
Posts: 797
Status: Offline
 Re: Graphing inequalities with 2 variables Reply to this Post Reply with Quote

 Does xmin and xmax function gives exact result?

The xmin and xmax are just the x-interval values and they need to be selected...in this case, to include 0.
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Principal Skinner
 [Apr 16, 2012 7:05:18 AM] [Link]
steveghurd

United States
Joined: Apr 27, 2012
Posts: 1
Status: Offline

 Re: Graphing inequalities with 2 variables Reply to this Post Reply with Quote

How it is possible to plot the graph through this equation.
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 [Apr 27, 2012 6:17:11 AM] [Link]
pskinner

Joined: Apr 2, 2005
Posts: 797
Status: Offline
 Re: Graphing inequalities with 2 variables Reply to this Post Reply with Quote

 How it is possible to plot the graph through this equation.

I suggest you check out the web page of examples to get an idea of how to graph inequalities:

http://webgraphing.com/examples_inequality_2d.jsp
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Principal Skinner
 [Apr 27, 2012 11:13:02 PM] [Link]