1. Todd orders pictures from a photographer. Each picture costs $7.50. A one time shipping fee of $3.25 is added to the cost of the order. The total cost of Todd’s order before tax is $85.75. Write an equation to determine the number of pictures Todd ordered.
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Given:
Each picture costs $7.50
One time shipping cost = $3.25
Total cost of the order = $85.75
To FInd:
An equation to determine the number of pictures ordered.
Solution:
Define x:
Let x be the number of pictures bought.
Let y be the total amount of money collected.
Form the equation:
The $3.25 one time shipping cost is a fixed cost.
The $7.50 is a variable cost depending on the number of pictures ordered.
Therefore the equation:
⇒ y = 3.25 + 7.5x
Find the number of pictures bought.
The total cost is $85.75
3.25 + 7.5x = 85.75
7.5x = 82.50
x = 11
Answer: The equation is y = 3.25 + 7.5x and Todd bought 11 pictures.
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Answer:
the education is y = 3.25 + 7.5x and todd bought 11 pictures
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