How does the pattern of change between two variables in a linear relationship show up in a contextual relationship?

How does the pattern of change between two variables in a linear relationship show up in a contextual relationship?
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One variable is a multiple of the other. One context would bethe cost of buying tins of baked beans - with no discount for largepurchases. In the cost of one tin is x units then the cost of btins will by b*x units.
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