Acceleration, distance, and time problem, please help!

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?

Need solving this second acceleration problem.

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)