Determine if the ordered pairs below represent a function or not, giving a reason for your answer a) {(2, 3) (2, 4) (2, 5) (2, 6)}
b) {(7, 2) (4, -6) (2, -2) (4, -9)}

When y’all answer can y’all explain too !

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.