Answer:

The equation is more helpful because 3(7) - 2 = 19 and you can easily see the numbers.

OR

The (x, y) values are more helpful because you can add 1 to the x values until you derive 7 and add 3 to the y values until you derive 19.

OR

The graph is more helpful because you can find the x value of 7 and then locate the y value on the graph of 19.

Teacher noteS:

Any representation can be easier to use by an individual student.  It may be easier to see the pattern extension on the chart, or the equation can be easier to use to calculate f(x). The graph can also be chosen.  Students must justify their response for it to be complete and correct.