For example, the coordinates of two points on the coordinate axis are known, and the equation of connecting these two points into a straight line is found. At this time, we need to know the general formula of a linear function: y = kx+B, and we can get the equation of this straight line by substituting the known two-point coordinates into the formula and finding out k and b.
In addition, the application of linear function also includes: using two images of linear function to solve problems. In this case, we usually draw a simple coordinate axis first, and then draw the image of linear function, which is more convenient for us to solve the problem.
I hope I can help you ~