It is given that y=10-2x and x is smaller than or equal to 3
a)find the range of y
b)find the range of x+y
(answer with steps ,please)
數學inequality 急!!! 20點
2013-01-25 7:03 am
回答 (1)
2013-01-25 7:27 am
✔ 最佳答案
a)y = 10 - 2xx = (10 - y)/2
∴
(10 - y)/2 ≤ 3
10 - y ≤ 6
y ≥ 4
b) y = 10 - 2x
(x + y) = 10 - x
x = 10 - (x + y)
∴
10 - (x + y) ≤ 3
x + y ≥ 7
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