Transcript THE COORDINATE PLANE

THE
COORDINATE
PLANE
1-10
VOCABULARY
Intersect – to cross or divide something
Coordinate Plane – what is formed by the
intersection of 2 number lines
Axes – the 2 number lines of the Coordinate
Plane
Axes…
The lines that intersect are called
axes.
The horizontal number line is called
the x-axis
The vertical number line is called the
y-axis
The 4 Quadrants
The x- and y- axes divide the Coordinate
Plane into 4 Quadrants:
y
Quadrant
Quadrant
II
I
x
0
Quadrant
III
Quadrant
IV
Quadrants
count counterclockwise
The Origin
0 is the origin, or the starting point of the
intersection.
When we work with the Coordinate Plane,
we work with 2 number lines.
y
3
2
1
-3 -2
-1
01
-1
-2
-3
x
2
3
Ordered Pairs
An Ordered Pair gives the exact
coordinates, or location, of one particular
point.
Ordered Pairs are always written in this
form:
P: (x-coordinate, y-coordinate)
Ordered Pair Example
y
P: (-5, 4)
x-coordinate
y-coordinate
Step 1 – You must go to the
x-axis and find your xcoordinate
Step 2 – You must go to the
y-axis and find your ycoordinate
Step 3 – You must connect the
2 numbers you have. The
intersection is your point.
P: (-5, 4)
-6 -5 -4 -3 -2 -1
6
5
4
3
2
1
01 2 3 4 5 6
-1
-2
-3
-4
-5
-6
x
Helpful Hints…
Here’s some hints to use when figuring out
what Quadrant your point will be found in.
y
II
(-, +)
I
(+, +)
x
III
IV
(-, -)
(+, -)