Christopher orders a 3 topping pizza for $15.25 and a 5 topping pizza for $17.75. Write and solve a system of linear equations to find the price of a plain pizza( no toppings) and the cost of each topping.
cost of plain pizza --- x
cost per topping -----y
x + 3y = 15.25
x + 5y = 17.75
subtract them
2y = 2
continue .....