Ele - Algebra

## > Equations and Inequalities <

### Equations and Inequalities

An equation is a mathematical statement, in symbols, that two
things are the same (or equivalent). Equations are written with
an equal sign, as in    2 + 3 = 5.

Number sentences containing the equal sign (=)
symbol are equations.

equation examples:    8 + 9 =17      7 = 7            15 - 9 = 10 ?

An equation could be true are false. As you know 15 - 9 = 6  not 10

Inequalities

An Inequality is a statement about the relative size or order of
two objects. Could be
greater than  >  less than < or not equal to ≠

Example:  4 x 4 < 20 This inequality says 4 times 4 is less than
20.

Number sentences that do not contain an equal  sign
(=) are called inequalities

Inequalities examples:

7 + 9 < 20               20 > 9 * 3 ?                25 ≠ 4 * 5

Just like equations, Inequalities could be true are false. As you
know the inequality 20 > 9 x 3  is false, because 9 x 3 equals 27

more inequalities signs

≥ greater than or equal to

≤ less than or equal to