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Y k x for some constant k called the constant of variation or constant of proportionality. Other forms of direct variation. 5 2 Direct Variation A third type of variation is called joint variation joint variation is the same as direct variation except there are two or more quantities. What is a…

Where k is the constant of variation. To be more geometrical about it if y varies directly as x then the graph of all points that describe this relationship is a line going through the origin 0 0 whose slope. Activity 4 5 2 More Direct Variation Substitute the value of into the direct variation…