The main difficulty is that it is quite different from junior one mathematics, so it feels more difficult. Just as junior high school knowledge is more difficult than primary school knowledge, senior high school knowledge is more difficult than junior high school knowledge, and the difficulty is rising step by step.

Understand common basic questions:

1. To judge whether a formula is a function, we need to judge it according to the analytical formula of the function, and pay attention to the coefficient and number of x.

2. Finding the value or range of letter parameters according to the characteristics of the quantity of a linear function will be applied to the related knowledge points of equations and inequalities.

3. According to the values of k and b, judge the characteristics of the function image, such as the position of the passing quadrant and the intersection with the coordinate axis, as well as the trend of the function image.

4. Calculate and judge the values or ranges of k and b according to the trends and characteristics of function images, and analyze and judge according to the images by combining multiple function images.

5. According to the positive and negative k of the function, judge the increase of the function and compare the function values.

6. When a point is known on the function image, we often use the idea of equation to find the value of the letter parameter, or judge whether the point is on the function image.