Matt has $17 in income that he devotes entirely towards caffeine purchases, specifically coffee and tea. Tea costs $5/cup and coffee costs $1/cup. Also, tea is subject to a quantity tax of $2/cup, and coffee is subject to a value tax of 0%.
By how much will the slope of Matt's budget constraint change if his income were to increase from $17 to $37?
(Note: I'm looking for the change in the slope, so subtract the old slope from the new slope to get your answer)
(Note: The numbers change between questions, so read them carefully)