why 'm' and 'c' are the letters used (maybe not true but it makes a plausible story)
m = multiplier
c = constant
many thanks to Dan Meyer and also to Andrew Stadel for the insightful idea of using the heights of various numbers of stacking cups as a neat example of a linear relationship
this lesson benefits from the use of actual polystyrene or cardboard cups
these pictures are from Andrew Stadel's work
Fawn Nguyen's account of her lesson sequence on 'stacking cups' is also helpful
what is the height and lip height for these cups?
stacks of two different sized cups are explored in Andrew Stadel's videos
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