Functions
Four Representations
Sentence (verbally)
An iTunes gift card has a $15.00 credit. Every song downloaded will cost $1.
Numerically (ordered pairs)
(Number of Songs Downloaded, $ Remaining on Card)
(x,y)
(0,15)
(1,14)
(2,13)
(3,12)
(4,11)
(5,10)
(6,9)
(7,8)
(8,7)
(9,6)
(10,5)
(11,4)
(12,3)
(13,2)
(14,1)
(15,0)
(x,y)
(0,15)
(1,14)
(2,13)
(3,12)
(4,11)
(5,10)
(6,9)
(7,8)
(8,7)
(9,6)
(10,5)
(11,4)
(12,3)
(13,2)
(14,1)
(15,0)
Graphically
See attached
Algebraically
$ Remaining on Gift Card = $15 - Number of Songs Downloaded
y = 15 - x
y = 15 - x
Facts about Function
This relationship is a function.
It is a decreasing function.
It is a discrete function.
Domain: {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
Range: {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
It is a decreasing function.
It is a discrete function.
Domain: {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
Range: {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}