Graphic representation
If you have a function that is easy enough to graph,
choose some values for the independent variable, x, plug them into the function
to get a set
of ordered pairs
(x,f(x)), and plot these on the graph. Then connect the points
to best match how the points are arranged on the graph. Make sure you have
enough points.
You can use this technique for linear functions.
We represent functions on a Cartesian plane,
representing the x on the abscissa axis (the horizontal axis) and, the y, on
the ordinate axis (the vertical axis). Each point on the graph has two
coordinates, its abscissa x and its ordinate y.
Worked example:
Represent y = 2x
|
x
|
- 2
|
- 1
|
0
|
1
|
|
y = 2x
|
- 4
|
- 4
|
0
|
2
|
