Answer: The differences between the points (as shown on the graph) represent the change in the dependent variable (y) and the independent variable (x) for each pair of points. For example, the difference between the points (2, 3) and (4, 6) is 2 units in x and 3 units in y. This means that when x increases by 2 units, y increases by 3 units.
The unit rate is the ratio of the change in y to the change in x for any pair of points on the graph. It is also the slope of the line that passes through the points. The unit rate tells us how much y changes when x changes by 1 unit. For example, the unit rate for the points (2, 3) and (4, 6) is frac {3} {2}, which means that when x increases by 1 unit, y increases by frac {3} {2} units.
The correct answer to the question is:
is the unit rate because it compares the change in y-values to the change in x-values of the points on the graph.