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If the two variables in direct variation are X and Y then K is Y/X and this gives the equation Y = KX

Equivalently, if you write C = 1/K, then the constant of variation can be calculated as X/Y and this gives the equation as X = CY.

It does not matter which of the two you do as long as you use the correct resulting equation. Because of the relationship between K and C, one of them (at least in terms of school maths) will usually be an integer and so easier to work with.

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Q: How do you calculate k in direct variations?
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