It is a situation in which a variable changes by the same amount for a fixed change over in time (or in another variable).
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The amount a person pays for gas compared with the number of gallons purchased.
The slope of each point on the line on the graph is the rate of change at that point. If the graph is a straight line, then its slope is constant. If the graph is a curved line, then its slope changes.
Unit rate, slope, and rate of change are different names for the same thing. Unit rates and slopes (if they are constant) are the same thing as a constant rate of change.
A fraction is a numerical constant. Being a fraction does not alter that. And, as a constant, its rate of change is precisely zero.
A linear relationship.
The answer is : (B) A constant rate of acceleration. :)