Problem and Variable

By: Libby NorthamMrs.Klar-7

9-20-10

Problem:• Margret and Monica went to the

store to buy brownies. The brownies cost $10 each package, they bought 2 packages.

Equation:

X = Number of packagesY = The total cost

Y=10x or f(x)=10x

Independent and Dependent

• Independent- number of packages

• Dependent- the total cost

We know that Y depends on X. So the total cost depends on the number of

packages.

Function or not

• The data is a function because no “X” values repeat.

Domain and Range

• Domain- all the “X” values in the data• Range- all the “Y” values in the data

D:{1,2,3,4,5}R:{10,20,30,40,50}

Graph X 10x Y (X,Y)

1 10(1) 10 (1,10)2 10(2) 20 (2,20)3 10(3) 30 (3,30)4 10(4) 40 (4,40)5 10(5) 50 (5,50)

Discrete or continuous

• The data is continuous because it is not a line it is points.

Graph

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.50

10

20

30

40

50

60

Column2

Number of Packages

The

tota

l cos

t

Soooo…

• The total cost is depending on the number of packages that Margret and Monica buy $10 a pack. If the buy 2 packages than the spend $20.

Thank you for watching!