# Unit circle - Calculus question

by Sanya   Last Updated October 20, 2019 05:20 AM - source

Let $$(P_x, P_y)$$ be a point on the unit circle in the first quadrant which maximizes $$f(x,y) = 4x + y$$. Find $$P_y^2$$? How should I approach this question?

These are the options: a. 1/5 b. 1/9 c. 1/13 d. 1/17

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