Sasha noticed that the graph of the sales of yearbooks represented a proportional relationship. How could she have calculated the constant of proportionality by looking at the graph?
A
She could divide any y-value by its corresponding x-value.B
She could divide any x-value by its corresponding y-value.C
She could add any y-value to its corresponding x-value.D
She could subtract any x-value from its corresponding y-value.