8.F.3 Teacher Resource
Function Families: Which one doesn’t belong?
8.F.3 Interpret the equation y  mx  b as defining a linear function, whose graph is a straight
line; give examples of functions that are not linear. For example, the function A  s2 giving the
area of a square as a function of its side length is not linear because its graph contains points
(1,1), (2,4), and (3,9), which are not on a straight line.

Function Family Sets:
Teacher Resources Sheet
Set 1:
y  x3
y  x 2 1
y  2x 1
y  4 x

Set 2:
y  x2
y  2x 2 1
1 2
x 2
2
y  2x
y

Set 3:
y  3x
y  2 x 1
1 x
y   
2 
y  5x  3

