Practice Test
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Make a function table to obtain ordered pairs.
To graph the function y=1-3x, we will follow two steps.
To make a function table, we will select some values of x which will be part of our domain. Then, we will substitute these values for x to find the corresponding values of y. These x- and y-values will create a set of ordered pairs.
| x | 1-3x | y | (x,y) |
|---|---|---|---|
| - 2 | 1-3( - 2) | 7 | ( - 2, 7) |
| - 1 | 1-3( - 1) | 4 | ( - 1, 4) |
| 0 | 1-3( 0) | 1 | ( 0, 1) |
| 1 | 1-3( 1) | - 2 | ( 1, - 2) |
We found four ordered pairs that lie on the graph of our function.
Next, we will graph the ordered pairs and connect them with a straight line.
The line is the complete graph of the function. The ordered pairs corresponding to any points on the line are solutions of the equation y=1-3x.