5-13. See below: a = 21 y = 15 x = –3 b = 12 5-18. See = 10.5 x = x 5-19. Students should describe a pair of parallel lines. 5-20. + 2A + (A 15,000) = 109,000; 62,000 A – 5-21. See below: = 3 m (0, –2) = 3x 2 y – 5-22. See = 5 x = 2 x = 0 y = 38 x
5-13. See below: a = 21 y = 15 x = –3 b = 12 5-18. See x = 10.5 x = 5-19. Students should describe a pair of parallel lines. 5-20. A + 2A + (A – 15,000) = 109,000; 62,000 5-21. See below: m = 3 (0, –2) y = 3x – 2 5-22. See x = 5 x = 2 y = 0 x = 38
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