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.

zepdrix · Answer

Let's call the old price some mysterious hidden value `p`.

The new price is the old price + $4.
And the new price is $28.

`old price` `plus` $4 `is` $28

      `p`         `+`     4 `=`   28

zepdrix · Answer

Understand part a. okay?

anonymous · Answer

yes

zepdrix · Answer

$$\Large\bf\sf p+4\quad=\quad 28$$Do you understand how to solve for p?
How to find the old price?

anonymous · Answer

yes i have to subtract 4 from 28

zepdrix · Answer

good good good.

zepdrix · Answer

28 - 4 = ?

:o

zepdrix · Answer

Do you understand part c. ?
They want you to get comfortable with `checking your work`.
Understand how to do that?