This function is a piecewise function. Not difficult.

(1) Observing the image, it is not difficult to see that when X=0, y= 10, so your change is 10 yuan.

(2) If your own change is 10 yuan, the money you get from selling potatoes is: 46- 10 = 36 yuan. The corresponding potato X=30, so the price per kilogram of potatoes is 36/30= 1.2 yuan.

(3) This question is about the last screenshot, which is the image after x=30. 62-46= 16 16 yuan is the money from selling potatoes after the price reduction, and the price of potatoes is 0.8 per catty, so the number of potatoes is 16/0.8=20 jins. Plus 30 kilograms of potatoes sold at a reduced price, A * * * is 30+20=50, so A * * * brought 50 kilograms of potatoes.

I hope it helps you! Function is very important! Happy new year!