Page 254 - Math Smart - 7

Try and Apply!

O Draw a set of axes on a grid.

¨ Amazing

IV/ia+ham:
Mathematician
The coordinate system we
commonly use is called
the Cartesian system, after
the French mathematician
Rene Descartes (1596-
1650), who developed it in
the 17'^ century.
1
Legend has it that
Descartes, who liked to
6 - 5 - 4 -3 -2 - 1 0 1 \ ' . (
\

stay in bed until late, was "1
watching a fly on the
-?
ceiling from his bed. He
wondered how to best
describe the fly's location -A
and decided that one
-S
of the corners of the
-6
ceiling could be used as a
reference point.
Q Plot the following points. Join each set of points using straight lines.
a) (2, 6), {3, 6), {3, 7), (2, 7), (2, 6) STOP
b) (2, 2), {3, 2), {3, 5), (2, 5), (2, 2) STOP
c) (-5, 7), (-5, -3), (-3, -3), (-3, 1), (-1, 1), {-1, -3), (1, -3),

(1, 7), (-1, 7), (-1, 3), (-3, 3), (-3, 7), (-5, 7) STOP
@ What do you think you have drawn?

- Think and Share

O Are (2, 3) and (3, 2) coordinates of the same point?
Is the order in which the two numbers are written important?
© The pairs of numbers (-2, 0), (2, 3) and (8, 10) are examples of
ordered pairs. Why are they called ordered pairs?

UNIT 11 Coordinate Geometry and Graphs