units for mass
grams, kilograms, milligrams
units for volume
liter, milliliter, cubic meter mcubed, cubic centimeter cmcubed
units for area
square meter msquared, square cm cmsquared
units for density
kilogram per cubic meter kg/msquared, grams per cubic cm g/cmsquared
as x increases, y stays the same
constant
as x increases, y increases
direct
as x increases, y decreases
inverse