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Functions and Their Graphs

Topic Review on "Title":

Function (from a set X to a set Y):
A correspondence that associates with each element x (independent variable) of X and a unique element y (dependent variable) of Y. Notation: or .
Domain of a function:
The data set of all real numbers for which the correspondence makes sense.

One to one functions:
is a function from to .

Increasing functions:
If S is a subset of X and whenever, in S, then is an increasing function in S.

Decreasing functions:
If S is subset of X and whenever, in S, then is a decreasing function in S.

If  is a line which is not parallel to the -axis and if and are distinct points on, then the slope of  is given by:


Equation of a curve:
Suppose of a curve composed of points whose coordinates are  for 1, 2,….
If there is an equation, by which all the can be calculated through substituting, the equation is called the equation of the curve.

Equation of a line:
If the slope of a line is given (denoted by ) and if a point on the line is given (coordinate is ) , the line equation would be .

Vertical shifts:
If is a real number, the graph of is the graph of shifted upward units for or shifted downward for .

Horizontal shifts:
If is a real number, the graph of is the graph of shifted to the right units for or shifted to the left units for .

Reflection in the y-axis:
The graph of the function is the graph of reflected in the y-axis.

Reflection in the x-axis:
The graph of the function is the graph of reflected in the x-axis.

Vertical stretching and shrinking:
If is a real number, the graph of is the graph of stretched vertically by for or shrunk vertically by for .

Horizontal stretching and shrinking:
If is a real number, the graph of is the graph of stretched horizontally by for or shrunk horizontally by for .

Composite functions:
If is a function from to and is the function from to , then the composite function is the function from to defined by .

Inverse functions:
Let be a one to one function from to . Then, a function  from to is called the inverse function of if for all in and for all in

Rapid Study Kit for "Title":
Flash Movie Flash Game Flash Card
Core Concept Tutorial Problem Solving Drill Review Cheat Sheet

"Title" Tutorial Summary :

This tutorial describes what a function is and its properties. Graphing a function allows for the discussion of specific function properties such as transformations of functions, composite and inverse functions.

The correspondence between two sets is shown as part of introducing a function in set notation form. The domain of a function is important so an understanding of the inverse of a function can be established by the use of examples. The concept of increasing and decreasing functions is shown through the examples.

Tutorial Features:

Specific Tutorial Features:

• Step by step examples are shown to introduce functions, ordered pair of functions, and graphs of functions.
• Sketches of functions with visual aids are shown in the tutorial to help introduce concepts such as increasing and decreasing functions.

Series Features:

• Concept map showing inter-connections of new concepts in this tutorial and those previously introduced.
• Definition slides introduce terms as they are needed.
• Visual representation of concepts
• Animated examples—worked out step by step
• A concise summary is given at the conclusion of the tutorial.

"Title" Topic List:
Correspondence between two sets
Definition of functions
Domain of functions
One to one functions
Ordered pair of a function
Increasing and decreasing functions
Linear functions in two variables
Definition of slope
Equation of a line
Parent Functions
Definition of parent functions
Transformations of functions
Vertical shifts
Horizontal shifts
Reflection in the y-axis
Reflection in the x-axis
Vertical stretching and shrinking
Horizontal stretching and shrinking
Composite and inverse functions

See all 24 lessons in College Algebra, including concept tutorials, problem drills and cheat sheets:
Teach Yourself College Algebra Visually in 24 Hours

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