Download Algebra 1 Section 2.1 Graph and order real numbers Find absolute

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
7
-2
0
a
Opposite
-7
2
0
-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 |
- (-4)
| 15 |
- (-|-13|)
|0|
| -12 | + | 16 |
Find the solution:
|x|=9
|x|=7
Assignment:
page 67
Problems 15 – 72 divisible by 3