Answer:
See below.
Step-by-step explanation:
It isn't clear if the problem wants to know the number of video games sold, or the number remaining.
<h2><u>
Remaining Games</u></h2>
Let N be the number of video games in the store after d days. Assume none are replaced after they are sold.
N = 30 - 6d [Remaining games, N, are 30 minus the number of days, d, times 6 games/day] We need to also state 30 ≥ N ≥ 0. [No negative games are allowed. They are bad for morale].
<h2><u>
SOLD Games</u></h2>
Let N be the number of games sold over n days.
N = 6d [Games sold] Here, we need to state 0 ≤ N ≤ 30. [We can't sell more games than we have, unless you are a fast runner].
