9.99 + 1.29n < 50 is the inequalities describes this situation
Solution: Given that,
Lin got a $50 gift card to an online music store
She uses the gift card to buy an album for $9.99
Each song costs $1.29
Let "n" be the number of songs Lin wants to buy
From given,
Total amount she has = $ 50
Total amount spent = 9.99 + 1.29n
Therefore,
Total amount < Total amount she has
9.99 + 1.29n < 50
Therefore the answer is found.