Y=5x+4y=x answer choices a.(1,1),1),-1) show work ! i need guys

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Precalculus question, image attached.

Scott’s bank account showed a balance of $750 on sunday. during the next five days, he made one deposit of $140 and numerous withdrawals of $180 each. let x represent the number of withdrawals that scott made. write an inequality that can be used to find the maximum number of withdrawals that scott could have made and maintain a balance of at least $100. do not use a dollar sign ($) in your response.