What set of coordinates does not describe a function?

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

Graph the system: f(x)= 3/x-2; f(x)= 1/2x + 2

Which polynomial function has x intercepts -1, 0, and 2 and passes through the point (1, -6)