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Solve linear equations: word problems

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Learn it Let a variable stand for the unknown, write an equation from the story, solve it, and check the answer makes sense.

Example: A taxi charges $\$4$ plus $\$2$ per km. A ride cost $\$22$. How far was it?

  1. Let k = km. Cost: $4 + 2k = 22$.
  2. $2k = 18$, so $k = 9$.
  3. The ride was 9 km.

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