Yvaries inversely with x k = 4.5 what is the value of x when y is 9?

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

Which representation has a constant of variation of -2.5

What numbers are included in the set of integers? what numbers are not included?