4. Graphing a Function Rule
Sign In
Substitute some arbitrary values for x to find their corresponding y-values.
One way to graph a function rule is by making a table of values and substituting some arbitrary values for x. Doing so will give the corresponding values of y, which we can use to form ( x, y) coordinate pairs.
| x | 9-2x | y | (x,y) |
|---|---|---|---|
| 1 | 9 - 2( 1) | 7 | ( 1, 7) |
| 2 | 9 - 2( 2) | 5 | ( 2, 5) |
| 3 | 9 - 2( 3) | 3 | ( 3, 7) |
By connecting all of our points with a line, we form the graph of the function rule.