SITUATION 3 Consider the following set of data points (x, y): 1.0 2.0 3.0 4.0 5.0 5.0 6.5 2.0 3b) Suppose that a cubic equation that relates x and y is to be derived using least-squares method, given by y = A+ Bz + Cr + Dz Determine the normal equations that would determine the constants A. B. C. and D. Type your final answers in the provided text box below. 3c) Using the derived equations from (3b), determine the best-fit cubic equation that would describe the given data set and determine y at x - 3.5. Type your final answers in the provided text box below.

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