4. (20 points) Consider the system of linear equations Ax = b with +60-0--0 A = 1 1 Р 1 P and b where p and q are real numbers. (a) Find the values of p and q such that Ax=b has i. no solution. ii. exactly one solution. iii. infinitely many solutions. (b) Solve Ax = b when there are infinitely many solutions. =
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