Xiangjiao Version 8 on 2.1 "Functions and its Representation" ppt 3. The natural gas of a certain city's residents charges 1.88 yuan for 1m3, and the fee for using Xm3 natural gas is y (yuan). How to express y with a formula containing x? In this example, when x = 10, y = () yuan; when x = 20, y = () yuan, it can be seen that the cost y of using natural gas varies with the volume x of natural gas used.
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