Matt has $20 in income that he devotes entirely towards caffeine purchases, specifically coffee and tea. If tea costs $4/cup and coffee costs $4/cup, what is the horizontal coordinate of the horizontal intercept of Matt's budget constraint if he were to graph it with cups of tea on the horizontal axis and cups of coffee on the vertical axis?

(Note: The answer is not necessarily a whole number; round to the nearest hundredth)

(Note: The numbers change between questions, so read them carefully)