Posted by Anonymous on Friday, April 27, 2012 at 9:55pm.
12x + 3x + 7y = 180
15x + 7y = 180
15x + 60 < 180
15x < 120
x < 8
check:
pick a value of x,
1. x < 8 , e.g. let x = 4
then 48+12 + 7y = 180
7y = 120 , so 7y > 60 , OK!
2. x > 8 , e.g. x = 10
then 150 + 30 + 7y = 180
7y = 0 , and 7y > 60 is false
Therefore x < 8 is correct.
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