Use angle facts and diagram structure to find unknown angle measures.
Turn angle words into a solve-able setup
Problem
\(\text{Two}~\text{supplementary}~\text{angles}\) measure \(40°\) and \(3x°\). Write an equation that can be used to find \(x\).
Big Picture
What this problem is really about
Translate “supplementary” into a total before building the equation. Preserve each angle measure exactly as stated, add the numerical angle and the variable expression as the two parts, and set that sum equal to the straight-angle total. The task asks only for a model, so the correctly structured equation is the stopping point.
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