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.

Just imagine it

consider each

A. cone
if you cut a cone paralell to it's base, you get a circle
if you cut it perpendicular, you get  a triangle
triangle≠circle so not this one

B. sphere
if you cut a sphere paralell to it's base, you get a circle
if you cut it perpendicular, you get  a circle
circle=circle so this works

C. cylinder
if you cut a cylinder paralell to it's base, you get a circle
if you cut it perpendicular, you get  a rectangle
rectanlge≠circle so not work

D. cube
if you cut a cube paralell to it's base, you get a square
if you cut it perpendicular, you get  a square
square=square so this works

answers are B and D