There are three ways: a table, a graph, and an equation.
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Y=1/x
equation, table or a graph
The equation can be written as y = 16x/20 which can be simplified to y = 4x/5
y = cx where x and y are the two variables and c is a constant.
The constant of variation in a direct variation is the constant (unchanged) ratio of two variable quantities. The formula for direct variation is. y=kx (or y=kx ) where k is the constant of variation .