Recognize constant rate of change as evidence for a linear model.
Identify constant rate of change in context
Problem
Read this situation: A car travels \(180~\text{miles}\) in \(3~\text{hours}\) at a constant speed. Then identify the constant rate of change.
Big Picture
What this problem is really about
A contextual rate is a quotient whose order is determined by the requested units. We’ll place distance in the numerator and elapsed time in the denominator to create miles per hour, then reduce to a one-hour rate. Multiplying that unit rate back by the full time gives a quick consistency check.
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