If x is bigger than or equal to 11, express the ranges of values of b and c.
(1) b=13-5x
(2) c= (13-5x)/7
Thanks!
Inequalities 2條 20點
2010-01-24 1:20 am
回答 (1)
2010-01-24 1:39 am
✔ 最佳答案
(1) b = 13 – 5x5x = 13 – b
x = (13 – b)/5 >= 11
13 – b >= 55
13 – 55 >= b
-42 > = b
(2) c = (13 – 5x)/7 = b/7
-42 >= b
-6 >= b/7 = c
-6 >= c
收錄日期: 2021-04-23 23:21:14
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