Question 5

\fFind all values of x and y such that Px(x,y) = 0 and Py (x,y) = 0 simultaneously P(x,y) =5x - 10xy + 3y -40x + 56y -2 P (x,y) = 0 and Py (x,y) = 0 when x = and y=\fThe function S(T.r) = 30(T - 70)(3 -r) gives an ice cream shop's daily sales as a function of temperature T (in F) and rain r (in inches). Find S, (75,1) (include the appropriate units) and explain what it means S,(75,1) = - > Inches per dollar, dollake Rik inch, degrees Rex dollar, dollars, inclues, Explain the meaning of the correct answer from the previous step. Select the correct choice below and fill in the answer box within your choice. degrees, of degrees A. Daily sales decrease at a rate of $ per inch of rain when the temperature is 75 F and rainfall is 1". Rex B. Daily sales increase at a rate of $ per inch of rain when the temperature is 75 F and rainfall is 1" O C. Daily sales decrease at a rate of $ per 1 F in temperature when the temperature is 75"F and rainfall is 1". inch O D. Daily sales increase at a rate of $ per 1 F in temperature when the temperature is 75 F and rainfall is 1"