Posted by jonna on Tuesday, April 10, 2012 at 7:48pm.
Review your material on linear optimization. The max or min value of f(x,y) is found to be at the vertices of the region defined by the constraints.
Here, the region is a triangle, with vertices at (0,0) (2,0) (0,4)
f(0,0) = 1
f(2,0) = -1
f(0,4) = 5
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