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?
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In a straight line graph proportionality constant can be find by finding the slope of the line which has a formula.
slope= y2-y1/x2-x1
where y2 and y1 are points on y axis and X2 and X1 are points on x axis
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