Michael has a home-based business putting on childrem's parties. He charges $45 to design the partyand then $7.50 per child . Write a function rule ( equation) that relates the total cost of the party to the number of children n

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.