Question 920417
direct variation equation is y = kx
k is the constant of variation.


amelia bought 3 cds at 16 apiece for a total of 48 dollars.


the tax was 3.96.


the direct variation equation of y = kx becomes 3.96 = k * 48


solve for k to get k = 3.96 / 48 which is equal to .0825.


the direct variation equation of y = kx becomes y = .0825 * x


that is the equation that you graph.


the graph of that equation is shown below along with the value of y when x = 48.


the value of y = 3.96 as it should be.


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