Create equations in two or more variables, graph them, and interpret relationships with labels and scales.
Write a rational equation in two variables from a context
Problem
A \(120\text{-}\text{mile}\) trip is traveled at speed \(x\) with time \(y\). Write a rational equation relating \(x\) and \(y\), including the physical domain.
Big Picture
What this problem is really about
Anchor the model in distance equals speed times time, with the trip distance fixed. Solving that relationship for time puts speed in the denominator, which captures the inverse tradeoff: higher speed means less time. The algebra excludes zero speed, and the travel context narrows the model further to physically meaningful speed and time.
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