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13.
(a) ,
(b) ,
(c) ,
(d) ,
14.
(a) , ,
(b) , ,
(c) , ,
The method of Example 2 can be used for linear systems with infinitely many solutions. Use that method to solve the systems
15. in both parts at the same time.
(a)
(b)
In Exercises 16–19 find conditions that the b's must satisfy for the system to be consistent.
16.
17.
