I did it on paper just now. Sorry for the sloppy handwriting, but you should be able to answer the two questions with the info I got. If you don't know what five number summary is, just google it.
Basically, arrange the list of numbers in order, and then find the minimum, 1st quartile, median, 3rd quartile, and maximum.
It is a function, because they do not have a repeating number in the “Y” place (x,Y). If a set of orderd pairs had the y repeating, then it is not a function. The x can repeat, just not the y.
Answer: y = 4x + 1
explanation:
find the slope (y2 - y1)/(x2 - x1)
= (10-2)/(6-4) = 8/2 = 4
find y-intercept by using the slope to draw the line from one of the points