Algebra 1 Section 2.1 Graph and order real numbers Find absolute values and opposites The numbers used in algebra 1 are real numbers. They include whole.

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Presentation transcript:

Algebra 1 Section 2.1 Graph and order real numbers Find absolute values and opposites The numbers used in algebra 1 are real numbers. They include whole numbers {0,1,2,3…), integers {…-2,-1,0,1,2,…}, rational numbers (fractions and decimals) and irrational numbers (√7, π )

Every real number can be represented by a point on a real number line. Plot the numbers: 7, -4, 2⅓, -5.2, 6⅔, π

Both number lines and inequality signs can be used to order numbers. Inequality signs > < Greater than Less than Graph and order the numbers: 6, 5.1, -1.7,,

Two numbers that are the same distance from the origin are opposites. Number a Opposite a

The absolute value of a number is the distance the number is from the origin on a number line. It is denoted as |x|. Simplify | -8 | | 15 | | 0 | | -12 | + | 16 | - (-4) -(-|-13|)

Find the solution: | x | = 9 | x | = 7 Assignment: page 67 Problems 15 – 72 divisible by 3