The Coordinate Plane

A coordinate plane is formed when two number lines intersect.

The coordinate plane is used to locate points.

The two number lines meet at a right angle at their zero point.

What is the Coordinate Plane?

Origin (0,0), the point at which the number

lines intersect

x-axis: the horizontal number

line

y-axis: the vertical number line

Origin (0,0), the point at which

the number lines intersect

y-axis: the vertical number line

x-axis: the horizontal number

line

Quadrant II

Quadrant IVQuadrant III

Quadrant I

Quadrants are four sections of the coordinate plane.

What is the Coordinate Plane?

Origin (0,0), the point at which

the number lines intersect

y-axis: the vertical number line

x-axis: the horizontal number

line

Quadrant II

Quadrant IVQuadrant III

Quadrant I

An ordered pair of numbers is used to collate any point on a coordinate plane.

(4,5)The first number is call the x-coordinate; it means to move to the right or left of the horizontal number line.

The second number is call the y-coordinate; it means to move up or down along the vertical number line.

Ordered Pair

Example: point A

Step 1: Start at the origin.

Step 2: Move right on the x-axis to find the x-coordinate of the point, which is 2

Step 3: Move up the y-axis to find the y-coordinate, which is 7.

The ordered pair for point A is (2,7)

Write the ordered pair that names each point.

Identify Ordered Pairs

A

D

C

B

Example: point B

Step 1: Start at the origin.

Step 2: Move right on the x-axis to find the x-coordinate of the point, which is 7 0

Step 3: Move up the y-axis to find the y-coordinate, which is 08

The ordered pair for point B is (2,7)

Find the ordered pair for point B and C.

Write the ordered pair that names each point.

Identify Ordered Pairs

A

D

C

B

Graph (5,3)

Step 1: Start at the origin.

Step 2: Since the x-coordinate is 5, move 5 units to the right.

Step 3: Since the y-coordinate is 3, move 3 units up. Draw a dot.

Write the ordered pair that names each point.

Graph Ordered Pairs

Graph (-5,-3)

Step 1: Start at the origin.

Step 2: Since the x-coordinate is -5, move 5 units to the left.

Step 3: Since the y-coordinate is -3, move 3 units down. Draw a dot.

Write the ordered pair that names each point.

Graph Ordered Pairs

Write the ordered pair corresponding to each point on the graph. Then state the quadrant or axis on which each point is located.

Graph Ordered Pairs

A

BKF

I

L

DE

HJ

G

C