Does this set of ordered pairs represent a function? Why or why not?

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14