Both x and y denote functions of t that are related by the equation x2 + y? 2x + 6y. Use this equation and the given derivative to find the specified derivative. NOTE: Enter the exact answers. d.x dy (a) Given that -6, find dt when (x, y) = (4, 2). dt dy dt dy = 6, find dt d.x when (x, y) = (1+ v3,3 + v2). (b) Given that dt dx dt

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