You have two credit cards what is your debt ratio

Julia measured the high temperature in her town for one week. using the chart above, find the mean absolute deviation for the high temperatures. round your answer to the nearest tenth. be sure to show your work for finding: the mean of the set of data the distance of each number from the mean the mean absolute deviation

Through: (-3,-3) parallel to y= 7/3x+3

How do you use the elimination method for this question? explain, because i really want to understand!