First of all, we should understand the general formula of straight line: Ax+By+C=0 (where a and b are not 0 at the same time), and then we introduce the formula of point inclination:

Y-y0=k(x-x0), and two-point formula: (y-y0)/(y0-y1) = (x-x0)/(x0-x1).

Let's talk about oblique cutting and cutting first:

The formula Y=kx+b (k≠0) is oblique, so you can understand it if you understand it. It is a special case of point skew. It is called oblique only because it is known that the point is on the number axis and the coordinate of the point is (0, b). Y-Y0 = k (x-x0) Y-b = k(。 Therefore, the concept of oblique type is not a new concept, but a point oblique type.

(5) Interception formula: x/a+y/b= 1 This is the intercept formula. The intercept on the X axis is a, and the intercept on the Y axis is b, which is basically the same as the two-point formula, except that the two points are on the coordinate axis, that is, (a, 0) (0, b). We use the two-point formula to introduce:

(y-y0)/(y0-y1) = (x-x0)/(x0-x1) (y-0)/(0-b) = (x-a)/(a-0)-y/b. One on the x axis. A is not the intercept of a straight line on the X axis, and B is not the intercept of a straight line on the Y axis? Therefore, understanding the intercept formula conceptually is not a new concept, but it is still a two-point formula.

From the above examples, it should be seen that mathematical formulas sometimes don't have to be memorized, and understanding is the most important thing. Once you have mastered the concept, coupled with full understanding, coupled with more common questions, it is not too difficult to master the problem-solving methods and learn mathematics well, but it is important to work hard!