## Adventure Play sells an mp3 player for $18.00 and charges$3.25 per song. King Music sells a player for $23.00 and charges$2.00 per song. F

Question

Adventure Play sells an mp3 player for $18.00 and charges$3.25 per song. King Music sells a player for $23.00 and charges$2.00 per song. For how many songs will the cost be the same?

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Explanation:

Translate the english language to mathematical (algebraic) language.

This implies to define the variables and translates the statements into equations.

Play sells an mp3 player for $18.00 and charges$3.25 per song.

Cost = price of the mp3 player + price each song * number of songs

Variables:

number of songs: n
price each son: $3.25 price of the mp3 player:$ 18.00
Cost: c(n), this means that the cost is a function of n.

c(n) = 18 + 3.25n

2) King
Music sells a player for $23.00 and charges$2.00 per song. For how many
songs will the cost be the same?

Using the same procedure used for Adventure Play case:

c(n) = 23 + 2n

3) Equal cost =>

18 + 3.25n = 23 + 2n

=> 3.25n – 2n = 23 – 18
=> 1.25n = 5
=> n = 5 / 1.25
=> n = 4

Answer: the cost will be the same for 4 songs.