Write and solve a linear equation from a short verbal or contextual situation.
Pick the right equation from several choices
Problem
A music app charges \(\$5\) plus \(\$2~\text{per}~\text{download}\) for a \(\$17\) total. Verify the candidate equation structures, then solve the valid equation. Report its letter followed by the number of downloads.
A. \(5~+~2d~=~17\) B. \(2(5~+~d)~=~17\) C. \(5d~+~2~=~17\)
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What this problem is really about
Match every term to its role before doing any algebra: five dollars is charged once, while two dollars repeats for each download. The valid structure must add that fixed fee to two times the unknown count and make the total seventeen. Then remove the fee, divide by the per-download rate, and check that the reconstructed cost matches the bill.
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