Valentina is being careful with her spending so she can later purchase a house. She has allocated no more than $320 each month for both travel expenses and eating out. On average, every time she eats out it costs $16, and every travel journey costs $5.

Let x be the number of times she eats out and y represent the number of travel journeys each month.
Write an inequality representing the relationship between x and y, with y as the subject.