Slide 2:
The Number Plane and Quadrants Two number lines at right angles create a number plane with 4 quadrants 1st quadrant 2nd quadrant 3rd quadrant 4th quadrant
x and y co-ordinates :
x and y co-ordinates Every point on the number plane can be found with two numbers.
One along the horizontal scale labelled x and one on the vertical scale labelled y
These are called co-ordinates (x, y) Where is (2, 3)? Or ( -2, 4) Or (-1,-4) Or (4,-3) So (1,2) is one along the x scale from zero and two along the y scale from zero So, that’s co-ordinates.
Lets look at connecting them together …
Connecting co-ordinates :
Connecting co-ordinates If we connect these points we get a horizontal line (-4, 2) (-1,2) (1,2) (3,2) (5,2)
Connecting co-ordinates :
Connecting co-ordinates If we connect these points in the order written we get a rectangle (-3,2), (3,2), (3,-1) (-2,-1) Plot the following coordinates