(-3, 3), (1, 1), (0, -2), (1, -4) (5, -1) find the domain and range and if it is a function

Find the solution of system of equation y= x-4 y=4x+2

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.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?