What is the contrapositive of the conditional statement? if two variables are directly proportional, then their graph is a linear function. if two variables are directly proportional, then their graph is not a linear function. if two variables are not directly proportional, then their graph is not a linear function. if the graph of two variables is a linear function, then the two variables are directly proportional. if the graph of two variables is not a linear function, then the two variables are not directly proportional.