The function f(x, y) = ax + by has an average value of 45 on the rectangle 0 < x< 5,0 < y < 6. (a) What can you say about the constants a and b? (Give your answer as an equation that describes the values of a and b.) (b) Find two different choices for f that have average value 45 on the rectangle. f , or %3D f =

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