10.
In Exercises 11–14 find using Theorem 2.1.2.
11.
12.
13.
14.
Let
15.
(a) Evaluate using Theorem 2.1.2.
(b) Evaluate using the method of Example 4 in Section 1.5.
(c) Which method involves less computation?
In Exercises 16–21 solve by Cramer's rule, where it applies.
16.
17.
18.