Question

You are purchasing phone cases for your phone. You received a coupon

for $5 off your total purchase. Each case costs $14.50. Let crepresent
the total cost of the phone cases and prepresents the number of phone
cases purchased.
How would you determine the cost of 3 phone cases? Write an equation,
describe the steps of the substitution, and label your final answer.
You may start your response with:
● To determine the cost of 3 phone cases I calculated...
The steps of substitution are...
●
Respond in 3 to 5 complete sentences.

Answer 1

Answer: $38.50

Explanation:

To determine the cost of 3 phone cases, I calculated the total cost of the cases without the coupon and then subtracted the coupon amount from it. Each case costs $14.50, so the total cost of 3 cases would be 3 multiplied by $14.50, which equals $43.50.

To incorporate the coupon, I subtracted the $5 coupon amount from the total cost of the cases. Therefore, the equation would be: c - 5 = 43.50, where c represents the total cost of the phone cases.

To solve the equation using substitution, I substituted the value of c in the equation with the total cost of 3 phone cases, which is $43.50. So, the equation becomes 43.50 - 5 = 43.50.

Finally, simplifying the equation, the cost of 3 phone cases is $38.50.