Using a formula I

Using a formula I

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This task is about working out what parts of a formula mean.
The Grandstand Rugby Clothing Company sells their products over the Internet.

Question

a)
They use this formula to work out how much it costs in total to buy and transport jerseys within New Zealand.
 
 
C = 100x + 5
 
What does the x in the equation represent?
 

    • The total cost of the jerseys.

    • The number of jerseys ordered.

    • The cost of transportation.

    • The cost of each jersey.

How did you work this out?

Question

b)
They use the following formula to work out the total cost of exporting an order of scarves to England.
 
 
          C = 40z + 15
 
What does the 15 in the equation represent?

    • The number of scarves ordered.

    • The cost of each scarf.

    • The total cost of the scarves.

    • The cost of transportation.

How did you work this out?
Task administration: 
This task can be completed with pencil and paper or online.
Level:
5
Curriculum info: 
Maths, Number and Algebra, Equations and expressions
Keywords: 
linear equations, intercepts
Description of task: 
Students identify different parts of linear formulae which describe costs for buying and transporting clothing.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Using symbols and expressions to think mathematically, sets 6-7
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
   

Y10 (08/2001)
a) The number of jerseys ordered (Option 2) easy
b) The cost of transportation (Option 4) easy