PSYCHOLOGY QUESTION PLZ HELP?

A positive correlation means that as variable "X" goes up , variable "Y" goes up . A negative correlation means that as variable "x" goes up , variable "y" goes down . a coefficient is a numerical summary of the direction and strenght of the linear ociation btwn varibales . wat are the coefficents for ( a) a perfect positive correlation ( b) a perfect negative correlation ( c) a perfect zero correlation ?? .. how do u interpret a zro correlation