Unit Conversion using Algebraic Substitution

It was great that my Chair, Iain McNab, was able to join us for our screencasting day. This is a great example of how different approaches may make more sense to different students, depending on their thinking.

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Direct Variation – both methods

Given y is directly proportional to x and y46 when x62, find y when x17.


Proportions – Solving for the variable

Student solution for solving for x in a proportion by cross-multiplication.


Solving for x in a proportion

Solving for x in a proportion


Unit conversion – seconds to days

Student solved problem where seconds are converted to days.


Indirect Variation – both methods

Given y is indirectly proportional to x and y95 when x54, find y when x17.