The price of rolls of film is $2.50 and the price camera batteries is $1.50.
of Two equations can be derived from the question:
8f + 2b = 23 equation 1
6f + 2b = 18 equation 2
Where:
f = rolls of film
b = camera batteries
In order to determine the value of f, subtract equation 2 from 1
2f = 5
Divide both sides of the equation by 2
f = 2.50
In order to determine the value of b, substitute for f in equation 1:
8(2.50) + 2b = 23
20 + 2b = 23
2b = 23 - 20
2b = 3
b = 1.50
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