The rate of change, or slope, is exactly what it sounds like: the amount of change in a certain interval of time. It can be defined as
[tex]\frac{rise}{run}[/tex], or [tex]\frac{change in y value}{change in x value}[/tex]
In order to find the slope of an equation, we can use this formula:
[tex]\frac{y2 - y1}{x2 - x1}[/tex] (numbers after variables are subscript)
What this means is that for a certain y value (y2), we subtract the y value before it (y1), and the same for the x. Because the question says "the rate of change is constant," we only need to find this once. In this case, I will use the first 2 data sets in the table:
[tex]\frac{6 - 4}{318 - 212}[/tex]
= [tex]\frac{2}{106}[/tex]
= [tex]\frac{1}{53}[/tex]
Therefore, the answer would be C) [tex]\frac{1}{53}[/tex]; your car travels 53 miles every 1 hour.
Hope this helps! :)
