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Two knowledge points need to be sorted out in the second volume of senior high school mathematics
# Senior 2 # Introduction While learning new knowledge, you must review the old knowledge before, which will definitely make you very tired, so pay attention to the combination of work and rest. Only abundant energy can meet new challenges, and learning can get twice the result with half the effort. The second channel of Senior High School has compiled the Compendium of Compulsory Two Knowledge Points in the second volume of Senior High School Mathematics for you, hoping to help you with your study!

1. Two knowledge points need to be sorted out in the second volume of senior two mathematics.

1. Definition and definition formula of linear function: Independent variable X and dependent variable Y have the following relationship:

y=kx+b

It is said that y is a linear function of x at this time.

In particular, when b=0, y is a proportional function of x.

Namely: y=kx(k is a constant, k≠0)

Second, the properties of linear function:

The change value of 1.y is directly proportional to the corresponding change value of x, and the ratio is k.

That is: y=kx+b(k is any non-zero real number b, take any real number)

2. When x=0, b is the intercept of the function on the y axis.

Iii. Images and properties of linear functions:

1. Practice and graphics: Through the following three steps.

(1) list;

(2) tracking points;

(3) The connection can be the image of a function-a straight line. So the image of a function only needs to know two points and connect them into a straight line. (Usually find the intersection of the function image with the X and Y axes)

2. Property: (1) Any point P(x, y) on the linear function satisfies the equation: y = kx+b (2) The coordinate of the intersection of the linear function and the y axis is always (0, b), and the image of the proportional function always intersects the origin of the x axis at (-b/k, 0).

3. Quadrant where K, B and function images are located:

When k>0, the straight line must pass through the first and third quadrants, and Y increases with the increase of X;

When k0, the straight line must pass through the first and second quadrants;

When b=0, the straight line passes through the origin.

When b0, the straight line only passes through the first and third quadrants; When k