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)


Graphically

See attached


Algebraically

$ Remaining on Gift Card = $15 - Number of Songs Downloaded
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}