Question

definition of direct and Inverse variation

Answer 1

Two quantities x and y are said to be in direct variation if x and y increase and decrease to together in such a way that x/y remains constant (positive)

Two quantities x and y  are said to be in inverse variation if an increase in x causes the corresponding decrease in y (and vice-versa) in such a manner that xy remains constant. We can find a constant k such that xy=k.