Can anyone plz answer question 7

Renita analyzed two dot plots showing the snowfall during the winter months for city a and for city b. she found that the median snowfall is 5 inches less in city a than in city b. the mean snowfall is about 2 inches less in city a than in city b. which explains why there is a difference in the measures of center for the sets of data?

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

Ill mark the brainliest if you me with the these three questions 7,8,9