sara can spend 150.00 on books and soft covers are 4.00 and hard covers are 7.00 how mush of each book can she get

do 150 divided by 7 for hard  and 4 for soft and you will get your answer

as the question is stated there is more than one answer. you need more information

If x is soft cover and y is hard caver then you can get any amount that satisfies this inequality. :)

4x+7y<150