If y varies directly as x and y =72 when x =8 find x were y =65

For a direct relation, y = kx, k being a constant.

For your problem, just plug in the numbers. 

(72)= k(8), k=9

So, using this plug k into the equation to find x when y =65. 65=9x, x would equal 65/9. 

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.