Solve one-step equations and interpret the solution in context.
Select and solve a one-step context equation
Problem
A class has \(18\) students after \(4\) join. Verify the structure of the candidate equations, then solve the valid equation. Report its letter followed by the starting number.
A. \(x~+~4~=~18\) B. \(x~-~4~=~18\) C. \(4x~=~18\)
Big Picture
What this problem is really about
Define the unknown as the class size before anyone joined. Because four students join and the count then reaches eighteen, the valid equation must show the start increasing by four, not decreasing or forming equal groups. Undo that increase to recover the start, then add the joiners back as a story check.
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