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### Linear Functions

A

*linear*function is a function of the form f(x) = ax + b, where a and b are constants and a is nonzero. Its graph is a straight line. The x coordinate of the point at which the graph crosses the x axis is called the*x-intercept*. The*y-intercept*is defined similarly. Values of x for which f(x) = 0 are called*zeros*of f.A

*linear equation*can be written in the form ax + by = c for some constants a, b, and c, where either a or b is not 0. If these constants are integers, the equation is in*standard form*.The graph of a linear equation is a straight line.

### Linear Functions

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

- Intro 0:00
- Definition 0:12
- Linear Equation
- Example: A and B not zero
- Example: B is zero
- Example: A is zero
- Graph and Intercepts 1:43
- Straight Line
- x-intercepts, y-intercepts
- Example: Intercepts
- Graphing Linear Equations 4:19
- Example
- Linear Functions 7:23
- Example
- Lecture Example 1 10:11
- Lecture Example 2 12:42
- Additional Example 3
- Additional Example 4

0 answers

Post by Tomas Johnsen on March 2, 2012

On example 1 you say that -xy shouldn't be there, but I don't know why that is. Maybe I missed something.