Co-ordinates

1
Co-ordinates
2
Co-ordinates tell us where a point is on a grid.
y
First we look at how far ACROSS the grid the
point is, this is on the horizontal axis.





4
x
V E R T I C A L
2 Across
3
Then we look at how far up the point is, this is
on the vertical axis.
2
4 up
1
x
0
5
4
3
2
1
HORIZONTAL
3
Co-ordinates tell us where a point is on a grid.
y
We write the numbers with the horizontal number
first





4
x
V E R T I C A L
2
4
3
,
2
We separate the numbers with a comma.
1
x
0
5
4
3
2
1
HORIZONTAL
4
Co-ordinates tell us where a point is on a grid.
y





4
x
V E R T I C A L
2
4
(
(
3
,
2
We put brackets around the co-ordinates.
1
x
0
5
4
3
2
1
HORIZONTAL
5
What are the co-ordinates of these points?
10










x
x
9
x
x
8
V E R T I C A L
7
6
x
5
x
x
4
x
3
2
x
x
1
0
10
9
8
7
6
2
5
4
3
1
0
HORIZONTAL
6
So far we have looked at co-ordinates in one
quadrant
5





4
3
2
1
0
5
4
3
2
1
7
We can also have co-ordinates in more than one
quadrant
5










4
3
2
1
0
5
4
3
2
1










8
We have to extend our axis to fit the extra
quadrants
5










4
3
2
1
0
5
4
3
2
1










9
We now have to number our axis Because they go
past 0 they are negative numbers
5










4
3
2
1
0
5
4
3
2
1










-1
-5
-4
-3
-2
-1
-2
-3
-4
-5
10
We still use the same rule across first then up
5










4
x
3
2
1
0
5
4
3
2
1










-1
-5
-4
-3
-2
-1
-2
-3
-4
-5
11
The x is at -2 on the horizontal axis and at 3 on
the vertical axis
5










4
-2
3
(
)
x
,
3
2
1
0
5
4
3
2
1










-1
-5
-4
-3
-2
-1
-2
-3
-4
-5
12
This x is at 4 on the horizontal axis and -3 on
the vertical axis
5










4
-2
3
(
)
x
,
3
2
1
0
5
4
3
2
1










-1
-5
-4
-3
-2
-1
-2
(
)
4
-3
x
-3
,
-4
-5
13
This x is at -5 on the horizontal axis and -2 on
the vertical axis
5










4
-2
3
(
)
x
,
3
2
1
0
5
4
3
2
1










-1
-5
-4
-3
-2
-1
-5
-2
(
)
x
-2
(
)
4
-3
,
x
-3
,
-4
-5
14
What are the co-ordinates of these points?
5










x
4
x
3
2
x
1
x
0
5
4
3
2
1










-1
-5
-4
-3
-2
-1
x
-2
x
-3
x
x
-4
-5
15
Well done!