"Graphic of a linear function" PPT courseware of linear function

Description

"Graphic of a linear function" PPT courseware of linear function

Knowledge review

If the relationship between two variables x and y can be expressed in the form of ________(k, b is _____ and k _____), then y is said to be a linear function of x (x is ______, y is ___ __ ). In particular, when b=___, (that is, 0), y is said to be a proportional function of x.

concept

Take the values ​​of the independent variable

Do it

(1) Draw the graph of the linear function y=-2x+5.

(2) Pick several points on the created image, find their abscissa and ordinate, and verify whether they all satisfy the relationship y=-2x+5.

Discuss

(1) Are the points (x, y) corresponding to x and y that satisfy the relationship y=-2x+5 all on its image?

(2) Do all points (x, y) on the graph of the linear function y=-2x+5 satisfy its relational expression?

(3) What are the characteristics of the graph of linear function y=kx+b?

The graph of the linear function y=kx+b is a straight line. Its graph is also called the straight line y=kx+b.

Tip: To construct the graph of a linear function, you only need to determine two points.

summary:

1. Steps to draw the graph of a linear function:

① List ② Draw points ③ Connect lines

2. The graph of a linear function y=kx+b is a straight line. The graph of a linear function y=kx+b is also called a straight line y=kx+b.

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Update Time: 2024-11-16

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