Introduction to Introduction to Coordinate GraphsCoordinate Graphs

DefinitionGrid/Graph – a set of uniformly – a set of uniformly

spaced horizontal and vertical line spaced horizontal and vertical line segments.segments.

DefinitionCoordinate Grid – a grid used to – a grid used to

locate a point by its distances from locate a point by its distances from 2 intersecting straight lines.2 intersecting straight lines.

1 2 3 4 5

1

2

3

4

5

00

Definition x-axis: a a

horizontal horizontal number line on a number line on a coordinate grid; coordinate grid; represents the represents the dependentdependent variable.variable. x

1 2 3 4 50 6

DefinitionDefinitiony-axisy-axis: a vertical number line on a : a vertical number line on a

coordinate grid; represents the coordinate grid; represents the independentindependent variable. variable.

1

2

34

5

0

6

y

DefinitionDefinitionCoordinates:Coordinates: an ordered pair, used an ordered pair, used

to identify a location on a coordinate to identify a location on a coordinate plane.plane.

1

2

34

5

0

6

1 2 3 4 50 6

(3,4)

How to Plot Ordered PairsHow to Plot Ordered Pairs Step 1Step 1: Always find the x value first, : Always find the x value first,

moving horizontally along the x-axis.moving horizontally along the x-axis.

1

3

2

4

5

0

6

1 2 3 4 50 6

(2,3)

y

x

How to Plot Ordered PairsHow to Plot Ordered Pairs Step 2Step 2: Starting from your new : Starting from your new

position find the y value by position find the y value by moving vertically up.moving vertically up.

1

3

2

4

5

0

6

1 2 3 4 50 6

(2,3)y

x

How to Find Ordered PairsHow to Find Ordered Pairs

Step 1Step 1: Find how far over horizontally : Find how far over horizontally the point is by counting along the x-the point is by counting along the x-axis.axis.

1

3

2

4

5

0

6

1 2 3 4 50 6

y

x

(5,_)

How to Find Ordered PairsHow to Find Ordered PairsStep 2Step 2: Now count how far vertically the : Now count how far vertically the

point is by counting up.point is by counting up.

1

3

2

4

5

0

6

1 2 3 4 50 6

y

x

(5,4)

RememberRememberThe first number is always the The first number is always the x-x-

coordinatecoordinate. The second number is . The second number is always the always the y-coordinatey-coordinate..

1

32

45

0

6

1 2 3 4 50 6

(3,4)

What is the ordered pair?What is the ordered pair?

1

32

45

0

6

1 2 3 4 50 6

What is the ordered pair?What is the ordered pair?

1

32

45

0

6

1 2 3 4 50 6

What is the ordered pair?What is the ordered pair?

1

32

45

0

6

1 2 3 4 50 6

What is the ordered pair?What is the ordered pair?

1

32

45

0

6

1 2 3 4 50 6

Plot the ordered pair!Plot the ordered pair!

1

32

45

0

6

1 2 3 4 50 6

(3,4)(3,4)

Plot the ordered pair!Plot the ordered pair!

1

32

45

0

6

1 2 3 4 50 6

(4,6)(4,6)

Plot the ordered pair!Plot the ordered pair!

1

32

45

0

6

1 2 3 4 50 6

(3,2)(3,2)

CreditsCreditsClipart from “Microsoft Clip Gallery” located on the Internet at http://cgl.microsoft.com/clipgallerylive/default.asp

Math dictionary. (2006). Honesdale, PA: 2006.