What is the difference between line graph and linear graph

a line graph attaches individual data values so that we can see trends, if they exist. If there is a constant trend, either up or down or horizontal, then we have a linear graph. For example, if we wanted to know how many accidents an intersection had per month. If January had 7, February had 10, March had 5, etc, we have a simple line graph. If, however, every month had 5, or every month went up by 7 or down by 8, then our line graph would be linear. If we skip a month or even one month is not constant- say all the months but September have 6- then we do not have a linear graph.