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A proportional relationship is of the form y = kx where k is a constant.

This can be rearranged to give:

y = kx → k = y/x

If the relationship in a table between to variables is a proportional one, then divide the elements of one column by the corresponding elements of the other column; if the result of each division is the same value, then the data is in a proportional relationship.

If the data in the table is measured data, then the data is likely to be rounded, so the divisions also need to be rounded (to the appropriate degree).

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Q: How do you determine whether a relationship shown in a table is a proportional relationship?
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