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"Application of graphs of linear functions" linear function PPT courseware 2
A farmer brought several kilograms of home-grown potatoes to the city for sale. For convenience, he brought some spare change. After selling some at the market price, he sold them at a reduced price. The number of kilograms of potatoes sold was equal to the amount of money he held. (including spare change), as shown in the figure, answer the following questions based on the image.
(1) How much change do farmers bring?
(2) Try to find the relationship between y and x before price reduction
(3) From the expression, can you find the price per kilogram of potatoes before the price reduction?
(4) After the price reduction, he sold out the remaining potatoes at 0.4 yuan per kilogram. At this time, the money in his hand (including spare change) was 26 yuan. How many kilograms of potatoes did he bring in total?
Xiao Cong and Xiao Hui went to visit a scenic spot and arranged to meet at the "Fei Waterfall". At 7:00 in the morning, Xiao Cong took an electric car from the "Ancient Temple" and went to the "Fei Waterfall" along the scenic road. The speed of the car was 36km/h. Xiaohui also set off from "Tallin" at 7:00 am and rode an electric bicycle along the scenic road to "Falling Waterfall" at a speed of 26km/h.
(1) When Xiao Cong caught up with Xiao Hui, had they already passed the "meadow"?
(2) When Xiao Cong arrives at the "Flying Waterfall", how many kilometers away is Xiaohui from the "Flying Waterfall"?
After a sandstorm occurs, it accelerates when passing through open deserts, slows down when passing through towns and encounters protective forest belts, and finally stops. A meteorological institute observed the entire process of a sandstorm from the onset to the end, and recorded the image of the change of wind speed y (km/h) with time t (h) (as shown in the figure)
(1) Find the maximum wind speed of the sandstorm;
(2) Express the relationship between sandstorm wind speed y and time t in an appropriate way.
Review and review:
When using linear functions to solve practical problems, first determine whether the relationship between the two variables in the problem is a linear function? When it is determined that the relationship is a linear function, the analytical expression of the function can be obtained, and the image and properties of the linear function can be used to further obtain the results we need.
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