The given is : Substance A Cylinders; mass : Biggest(23g), medium(18g), smallest(14g)
Substance A Cylinders; volume : Biggest(23.5ml), medium(21.5ml), smallest(20ml)

Substance B Cylinders; mass : Biggest(72g), medium(56g), smallest(44g)
Substance B Cylinders; volume : Biggest(23.5ml), medium(21.5ml), smallest(20ml)

Plot the mass and volume data of the cylinders. Plot mass on the vertical axis and volume on the horizontal axis, then calculate the slopes of the line for cylinders A and B. What do you think the slope represents?