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Define variables with unitsTechnique

Technique

Define variables with units

Name every unknown and its unit before you write

3 min 3 steps

Minutes love to sneak into an hourly rate. I respect a good sneak, but I check every unit anyway.

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Used by

Translate a situation into an equationTacticName each number's job, then write the equation
Interpret terms, constants, and pointsTacticGive every number its unit, and the unit names it
Solve a system of two linear equationsTacticCancel one variable, then answer what's asked
Model and optimize with inequalitiesTacticWrite the limit, solve at its edge, round to what fits
Set up a proportion or unit rateTacticLabel every rate with units, then match or cancel them
Angle chasingTacticOne fact per step, from the given to the target