Question: Exercise 4. Use matrix operations to solve the following system of equations. 521 + 202 = 3 (1) 621 - 432 = 7 (2) Exercise

Exercise 4. Use matrix operations to solve the following system of equations. 521 + 202 = 3 (1) 621 - 432 = 7 (2) Exercise 5. Prove that cov(@, y) is a linear operator in both a and y. If a and y are random variable and a and b are two positive constants (non-random numbers), is corr(ax, by) = corr(@, y)? If it is, prove it. If it isn't, show what corr(ar, by) is equal to

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