Evaluate 6/x + 9 if x = 3

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

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

What will be the end result for the taxpayer who filed his federal income tax return using the 1040ez form shown belowa he'll owe $173b he'll receive a refund of $173c he'll owe $3921d he'll receive a refund of $3921