- 5. x + y ; for x = 3 and y = -3
- 6. xy ; for x = 3 and y = -3
- 10. 0.5x - 2y + 3 ; for x = 6 and y = 4
- 11. x + 2y - z ; for x = 3, y = 0, and z = -1
- 12. 6ab + 2ac ; for a = -2, b = 5, and c = 10
- 13. 34 - (3x - 4) ; for x = 9
- 14. 2x - 5 + 3x + 1 ; for x = 1.5
- 15. 2x2 - y2 + z2 ; for x = 0, y = -1, z = -2
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