Khan/khan-exercises — Issue #13560: Graphing inequalities 2 - Error (I think)
Author: KhanBugz
Created: 2012-02-10 15:35:35+00:00
State: open
Labels: leopard, safari, wrong-or-unclear

Reporter: pvmanning@mindspring.com

The line is correct as given, but I believe the the wrong side is shaded. Moving the x component to left side of the equation and dividing by 3 gives x-4y>-20. The values you use for x and y, gives a function above the equation of the line, not below it.

[graphing_inequalities_2.html?seed=39&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/graphing_inequalities_2.html?seed=39&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/graphing_inequalities_2.html?seed=39&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5B%5B0%2C5%5D%2C%5B4%2C6%5D%2Cfalse%2Ctrue%5D%2C%5B%5C%22%5C%22%2C%5C%22%5C%22%5D%5D%22%2C238%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5B0%2C5%5D%2C%5B4%2C6%5D%2Cfalse%2Ctrue%5D%2C%5B%5C%22(%E2%88%927%2C%E2%88%926\)(-7%2C%20-6\)%20is%20a%20solution%5C%22%2C%5C%22(6%2C%E2%88%928\)(6%2C%20-8\)%20is%20a%20solution%5C%22%5D%5D%22%2C95%5D%2C%5B%22hint-activity%22%2C%220%22%2C15%5D%2C%5B%22hint-activity%22%2C%220%22%2C17%5D%2C%5B%22hint-activity%22%2C%220%22%2C17%5D%2C%5B%22hint-activity%22%2C%220%22%2C20%5D%2C%5B%22hint-activity%22%2C%220%22%2C22%5D%2C%5B%22hint-activity%22%2C%220%22%2C23%5D%2C%5B%22hint-activity%22%2C%220%22%2C24%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5B0%2C5%5D%2C%5B4%2C6%5D%2Cfalse%2Ctrue%5D%2C%5B%5C%22%5C%22%2C%5C%22%5C%22%5D%5D%22%2C51%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5B0%2C5%5D%2C%5B4%2C6%5D%2Cfalse%2Ctrue%5D%2C%5B%5C%22%5C%22%2C%5C%22%5C%22%5D%5D%22%2C134%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5B0%2C5%5D%2C%5B4%2C6%5D%2Ctrue%2Ctrue%5D%2C%5B%5C%22%5C%22%2C%5C%22%5C%22%5D%5D%22%2C25%5D%2C%5B%22correct-activity%22%2C%22%5B%5B%5B0%2C5%5D%2C%5B4%2C6%5D%2Ctrue%2Ctrue%5D%2C%5B%5C%22(%E2%88%927%2C%E2%88%926\)(-7%2C%20-6\)%20is%20a%20solution%5C%22%2C%5C%22(6%2C%E2%88%928\)(6%2C%20-8\)%20is%20a%20solution%5C%22%5D%5D%22%2C173%5D%5D)

[[[[0,5],[4,6],false,true],["",""]],[[[0,5],[4,6],false,true],["(−7,−6)(-7, -6) is a solution","(6,−8)(6, -8) is a solution"]],[[[0,5],[4,6],false,true],["",""]],[[[0,5],[4,6],false,true],["",""]],[[[0,5],[4,6],true,true],["",""]],[[[0,5],[4,6],true,true],["(−7,−6)(-7, -6) is a solution","(6,−8)(6, -8) is a solution"]]]

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