The quantities between which a graph is plotted are called variables.The independent variables are those which do not depend on other quanitity for example time.The dependents variables are those which depend on other quantity for example velocity,acceleration,speed,momentum etc.
HI i was wondering 1 what engineer choice you are going for and two if this is what you mean. study hard to to bed early and make class . (im saying this becasue i have done it before :])