I need help with this

What is the rate of change of a line that passes through (2,-5) and (6,-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.

How many grams the dog will eat in 3 days?