76% © uo 10:13 * ll. Gmail ► Q.jpg 1. If z = 2xy – 3x?y and x is increasing at 2 cm/sec determine at what rate y must be changing in order that z shall be neither increasing nor decreasing at the...

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Extracted text: 76% © uo 10:13 * ll. Gmail ► Q.jpg 1. If z = 2xy – 3x?y and x is increasing at 2 cm/sec determine at what rate y must be changing in order that z shall be neither increasing nor decreasing at the instant when x = 3 cm and y = 1 cm. 2. Is there a direction u in which the rate of change of the temperature function T(x,y,z) = 2xy – yz (temperature in degrees Celsius, distance in feet) at P(1, -1, 1) is -3°C/ft ?Give reasons for your answer.