Co-ordinates

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 1 2 3 4 5 HORIZONTAL

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 1 2 3 4 5 HORIZONTAL

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 1 2 3 4 5 HORIZONTAL

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 1 2 3 4 5 6 7 8 9 10 HORIZONTAL

co-ordinates in one quadrant So far we have looked at co-ordinates in one quadrant 5 4 3 2 1 1 2 3 4 5

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

We have to extend our axis to fit the extra quadrants 5 4 3 2 1 1 2 3 4 5

We now have to number our axis Because they go past 0 they are negative numbers 5 4 3 2 1 -5 -4 -3 -2 -1 1 2 3 4 5 -1 -2 -3 -4 -5

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

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

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

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

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

Well done!