7. (5 points) The demand functions for two products are given below. p1, p2, q1,and q2 are the prices (in dollars) and quantities for products 1 and 2. Are these two products complementary goods or substitute goods? Justify your answer with a sentence. 91 - 200 - 3p1 + p2 92 - 150 + p1 - 2p2 8. (5 points) The demand functions for two products are given below. p1, p2, 91,and q2 are the prices (in dollars) and quantities for products 1 and 2. Are these two products complementary goods or substitute goods? Justify your answer with a sentence. 91 - 350 + p1 + 2p2 92 - 225 + P1 + P2 9. (5 points) Consider the Cobb-Douglas production function P(L, K) = 610.610.4. Find the total units of production when 19 units of labor and 12 units of capital are invested