The Coordinate PlaneBy: Stan Blackman

Jay High School

Lesson for Glencoe Algebra I Math

Section 4-1

Algebra I Glencoe Mathematics 2004

The McGraw Hill Companies Inc.

Vocabulary WordsAxes - two perpendicular number lines used for locating points

Origin – the intersection of the two axes

Y-axis – the vertical number line

X-axis – the hoizontal number line

Y-axis

X-axis

The four quadrants of the coordinate plane.

Quadrant I

Quadrant II

Quadrant IV

Quadrant III

Y-axis

X-axis

Signs of the quadrants.

(+,+)

(+,-)(-,-)

(-,+)

The Ordered Pair

(5,10)X-

coordinateY-

coordinate

Y-axis

X-axis

The Origin Point

OriginPoint(0,0)

•Always start at the origin to plot a point.

Y-axis

X-axis

Direction of Movement for the X-Coordinate

If the x-coordinate is positive move this way

If the x-coordinate is negative move this way

Y-axis

X-axis

Direction of movement for the Y-coordinate

If the y-coordinate is positive move this way

If the y-coordinate is negative move this way

Y-axis

X-axis

Name the given point.

(1,3)

(-5,-1)

(-2,1)

(4,0)

Y-axis

X-axis

(4,4)

(-3,-1)

First move

out on the X-axis

Next move on the Y-

axis

How To Plot a Point on the Coordinate Plane