The price of a pizza plus 14% delivery charge comes to a total cost of 18.24. What was the price of the pizza? Describe the situation as a linear equation, using x as the variable to describe the unknown quantity.

Solution

T h e p r i ce o f a p i zz a pl u s 14% d e l i v ery c ha r g e co m es t o a t o t a l cos t o f 18.24. Wha t w a s t h e p r i ce o f t h e p i zz a ? Descr ib e t h e s i t u a t i o n a s a l in e a r e q u a t i o n, u s in g x a s t h e v a r iab l e t o d escr ib e t h e u nkn o w n q u an t i t y .

Amount before addition : 16

Solution steps

Translate the problem into an equation:

18.24 = x + 0.14 x

18.24 = x + 0.14 x : x = 16

Amount before addition : 16