Plz help me .

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online