1. 4.1
Objective: Identify and plot points in
a coordinate plane.

2. Coordinate Plane
Y Axis
Origin (0,0)
X Axis
Quadrant 1 (+,+)Quadrant 2 (-,+)
Quadrant 4 (+,-)Quadrant 3 (-,-)

3. Ordered Pairs
• (x,y), (left/right, up/down)
• Identify:
– A
– B
– C
– D
C
D
B A
(2,4)(-4,4)
(1,-3)
(-3,-4)

4. Label
• Origin
• Y axis
• X axis
• Quadrant 1
• Quadrant 2
• Quadrant 3
• Quadrant 4
• (5,8)
• (-6,-5)
• (-7,5)
• (9,-6)

5. Graph: y=2x-1 (Domain: -2, -1, 0, 1, 2)
y=2x-
1x y

6. Graph: y=-1/3x+2 (Domain: -6, -3, 0, 3, 6)
y = -1/3x+2
x y

7. Graph: y=-1/3x+2 (Domain: -6, -3, 0, 3, 6)
y = -1/3x+2
x y