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In Problems 17-20 use determinants to decide whether the system has (a) a unique solution or...

In Problems 17-20 use determinants to decide whether the system has (a) a unique solution or (b) either no solution or infinitely many solutions. Do not solve the system.

17. 3x − 4y = 7

x + 2y = -4

20. 4u + 2v + 4w = 2

2u + v + 2w = 1

3u - 4v + w = -5

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