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(a)
Let y = mx + c
200 = 100m + c ... (1)
600 = 200m + c ... (2)
(2) - (1), 400 = 100m
So m = 4
Put m = 4 into (1), c = -200
Therefore the function is y = 4x - 200
(b)
$650 cups of juice are sold? do you mean 650 cups of juice are sold??? If yes:
Put x = 650
y = 650*4 - 200 = 2400
The profit is $2400.
參考資料
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