Coordinate Planes

Locating, Plotting & Reading Points on a GridCoordinate PlanesWhat is a Coordinate Plane?A plane formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis.

Plano formado por la interseccin de una recta numrica horizontal llamada eje x (x-axis) y una recta numrica vertical llamada eje y (y-axis).1 2 3 4 5-5 -4 -3 -2 -1 -1

-2

-3

-4

-5 1

2

3

4

5054321Purpose of the Coordinate PlaneLocation! Location! Location!

We use coordinate planes to find exact locations!

Real World Application One

Real World Application Two

Real World Application Three

Parts of a Coordinate PlaneX-Axis

Y-Axis

Origin

QuadrantHow to Use a Coordinate PlaneA Coordinate Pair is needed!

(x, y)

A coordinate pair tells the exact location on the coordinate plane.

The x number on the X-axis goes in the x place.The y number on the X-axis goes in the y place.

*Mathematicians use the x-axis first.Read Points(Figure out the Coordinate Pair)1) Start at the origin.2) Count the lines left or right toward the point. The number of lines you count goes into the x place of the coordinate pair.(x, y) becomes (2, y)3) Now count the lines up or down toward the point. However many lines you count goes into the y place of the coordinate pair.(2, y) becomes (2, 3)

Find PointsIn which quadrant is A? is B? is C? is D?

Which point is (4, -5)?

1) Start at the origin.2) Look at the first number and count that many lines from the origin left or right. (Right if its a positive number; Left if its a negative number)3) Look at the second number and count that many lines from where you were up or down. (Up if its a positive number; Down if its a negative number)Its Point C!

ADCBPlot PointsPlot (-2, 3)

Start at the origin.

-2 is in the x place, so find -2 on the x-axis.(count the lines on the x-axis from zero)

3 is in the y place, so find 3 on the y-axis.(count the lines on the y-axis from zero)

Practice!Read: At what point is the Church located?Read: At what point is the Forest located?Find: What is located at (-5, -2)?Find: What is located at (4, -4)?Plot: (2, -2)Plot: (-4, 3)