Chapter 9

Sections 9.1 and 9.2, page 82

1. x = -6/53, y = -91/53.

3. x = 103/21, y = -71/21, z = -4/63.

5. x = 5, y = 2, z = 4.

7. x = (b + c - a)/2, y = (c + a - b)/2, z = (a + b - c)/2.

Sections 9.3, page 91

15. 4xyz.

17. (b) x = -1, y = 2, z = 0.

(c) x = 2, y = -3, z = 3, w = 0.

(d) 

Section 9.4, page 97

5. (w - x)(w - y)(w - z)(z - x)(z - y)(y - x).

7. (w - x)(w - y)(w - z)(z - x)(z - y)(y - x).

9. r = 2, s = 2, t = 1.

11. r = 4, s = 2, t = 2.

13. (b) x =1, y = 1, z = 1.
 
 

Thursday, June 11, 1998