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.

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.

anonymous · Answer

a.
p + 4 = 28

b. 
p + 4 - 4 = 28 - 4

p = 24
c.
Substitute 24 for p:
24 + 4 = 28
28 = 28
True

anonymous · Answer

thanks