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Bell Motors manufactures two models of electric cars $1 and $2. The demand equations giving the relationship between the unit price, p and q, and the number of cars demanded per year, x and y, are p = 60, 000 - 4x - 2y, q = 50, 000 - 2x - 4y. What is the domain of the total yearly revenue function R(x, y)? Sketch the domain of R(x, y)