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Mathematics 7 Online
OpenStudy (anonymous):

how to find extreme values of function e.g. y=2x+9

Directrix (directrix):

The line enters quadrant 3 and exits quadrant 1. As x increases without bound, so does y. As x decreases without bound, y decreases without bound. There are no extreme values. http://www.wolframalpha.com/input/?i=y%3D2x%2B9

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