1. Cartesian Coordinate System
Section 1.1
Cartesian Coordinate System

2. The Real Numbers
The real numbers can be ordered and represented in order on a number line
-1.87
4.55

3. Cartesian Coordinate System
y-axis
(x, y)
x-axis

4. Cartesian Coordinate System
Ex. Plot (4, 2)
Ex. Plot (-2, 1)
Ex. Plot (2, -3)
(4, 2)
(-2, 1)
(2, -3)

5. Cartesian Coordinate System
Quadrants… II I
III IV

6. The Distance Formula

7. The Distance Formula Ex. Find the distance between (7, 5) and (-3, -2)10

8. The Equation of a Circle
A circle with center (h, k) and radius of length r can be expressed in the form:
Ex. Find an equation of the circle with center at (4, 0) and radius of length 3