one - to -one

for every y there is exactly one x

(horizaontal line test)

function

for every x there is exactly one y

(vertical line test)

range

set of allowable y s

(what y values the graph must have; what the relation will touch)

domain

set of allowable x s

(what x values the graph must have; what the relation will touch)

relation

set of ordered pairs

( x , y )

hyperbola

two curves, mirror to each other

inverse variation

two curves which never quite touch the axis ( xy = )

absolute value

will produce a v-shaped graph

radical

will produce a half-parabola shape

x =

will produce the normal shape, but sideways