Rate of change is essentially the same as the slope of a graph, that is change in y divided by change in x. If the graph is a straight-line, the slope can be easily calculated with the formula:
Vertical change ÷ horizontal change = (y2 - y1) / (x2 - x1)
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Find the slope of the tangent to the graph at the point of interest.
The answer depends on the rate of change of WHAT? The rate of change of the gas used? the rate of change of the gas left, the rate of change of the range that the vehicle will go? The question is too vague.
You can determine if a rate of change is constant, by taking the instantaneous rate of change at multiple points - if they are all equal to each other, it can be assumed that the rate of change is constant. Alternatively, you can differentiate the function (if there is an associated function) - if this comes to a constant i.e. a number, then the rate of change is constant.
Slope can be referred to by rate of change because it is the rate that x changes compared to y on a graph.
When something has a constant rate of change it means that it has a linear graph. The function can be written in the slope intercept form of y = mx + b.