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Two independent variables that can affect the cost of the supplies are:
An independent variable is a variable that can change freely.
For example in the given situation, we could define the independent variables:
Notice that these variables are independent because these don't depend on each other.
Then if each pencil costs A, and each notebook costs B, the cost function will be:
C(x, y) = A*x + B*y
So there you have two independent variables that affect the cost of the supplies.
If you want to learn more about independent variables, you can read:
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