Question

The cost of a ticket to an amusement park was increased by 4 dollars. The new cost is twenty-eight dollars.

a. Write a one-step equation that could be solved to find the old price. Let p represent the old price.
b. Solve the equation you wrote in Part a. Show all your work.
c. Explain how you know that the solution you found in Part b is the correct answer.

Answer 1

a)
p = 28 - 4
b)
p = 24
c)
If the old price was 24 dollars, and four dollars were added to it, the new price would be 28 dollars. Since this is true, the old price was 24 dollars.