Create equations in two or more variables, graph them, and interpret relationships with labels and scales.
Write an equation in two variables from a context
Problem
A rectangle has width \(x\), length \(y\), and area \(60\). Write an equation relating \(x\) and \(y\).
Big Picture
What this problem is really about
Begin with the geometric quantity that is held fixed, then connect it to the two named dimensions. Rectangle area comes from multiplying perpendicular side lengths, so the relationship must preserve a constant product rather than a constant sum. Keeping the variable meanings attached to the formula prevents confusing area with perimeter.
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