Xiao Gang bought an exercise book with 3 yuan. Given that each book costs 0.25 yuan, he wrote out the functional relationship between the number of books X and the remaining money y, and made the function image

Xiao Gang bought an exercise book with 3 yuan. Given that each book costs 0.25 yuan, he wrote out the functional relationship between the number of books X and the remaining money y, and made the function image

I don't know how you got the music column. Y = 3-0.25x
The picture is sketchy

The unit price of some kind of rice is 5 yuan / kg. When x kg rice is purchased, the cost is y yuan, then the function expression of Y with respect to X is y yuan_____ .

Y = 5x, that's it

If each student buys an exercise book with a unit price of 5 yuan, the functional relationship between the total purchase amount y (yuan) and the number of students n (people) is: where is the independent variable and is the function of

The function relation is y = 5N, where n is the independent variable and Y is the function of n