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| Numbers and Sets |
 About Algebra
Addition and Subtraction Multiplication and Division Criterions for Divisibility
 Types of NumbersGeometric Interpretation of Real Numbers Irrational Number  Properties of Real Numbers FractionsProportions Property of Equal Proportions
Absolute ValuesGraphical Illustrations
SetsSubsets Operations with Sets Intervals |
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In the figures below, there are shown graphs of the functions y = ± x and y = | x |.
(Put the pointer anywhere around the above figure to to get a graph of the
function y = –x.
)
Compaire also the other pair of graphs, y
= x2 – 4 x
+ 3 and y
= | x2 – 4 x
+ 3 |:
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