AY 2017 Sem 1 A113_W01_EXERCISE.docx

# School of engineering 3 y 6 2 3 6 y 10a 2 x 32 x 3 4

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School of Engineering 3 y = 6 2 3 6 y 10(a) 2 x − 3(2 x − (3 − 4 x )) =2 x − 3(2 x − 3 + 4 x ) =2 x − (6 x − 9 + 12 x ) =2 x − 6 x + 9 - 12 x = 9 + 2 x − 6 x - 12 x = 9 - 16 x (b) 3 x 2 − 5 x +10 11. 33 12. a) x = 4 y b) 2 3 5 y x c) c y x 1 10 d) hx + 2 x + y = 3 y + 7 hx + 2 x = 3 y + 7 – y ( h + 2) x = 2 y + 7 x = (2 y + 7)/ ( h + 2) 13.Profit = \$1.80 n - \$20 14. a) 7 1 57 ), 9 2 ( 4 1 100 Copyright © 2017 by Republic Polytechnic, Singapore Page 6 of 7
School of Engineering b) 791 , 9 ) 2 4 1 ( 100 15. a) c = –5 a b) 3 4 14 a a c 16. a) -22 b) d = 3 c c) -4 x d) 2 x +3 e e) -25 f) -1 g) 5 l 5 -1 =5 l -(-1) = 5 l +1 = 5 3 , i.e. comparing index, l +1 = 3 , l = 3 – 1 = 2 Copyright © 2017 by Republic Polytechnic, Singapore Page 7 of 7
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