The cost of a plane ticket was increased by $15. The new price is $84. What was the price before the increase?

1 Answer
Sep 25, 2016

The price before the increase is $69.

Explanation:

Use the equation: x + 15 = 84
x = the price before the increase
15 = how much the ticket has increased
84 = the resulting price of the increase

Simply subtract 15 from both sides of the equation.
The result is x = 69.