Answer:
Total cost is represented by expression 6x + 6y where x is cost of one sandwich and y is cost of one cookie.
Step-by-step explanation:
lets say cost of one sandwich = x
And cost of one cookie = y
given that each person order one sandwich and one cookie.
so cost of lunch of one person = 1 × cost of one sandwich + 1 × cost of one cookie
⇒cost of lunch of one person = 1×x + 1×y = x + y
six friends are there , so cost of lunch of six person = 6×cost of lunch of one person = 6 × ( x + y ) = 6x + 6y
hence total cost is represented by expression 6x + 6y where x is cost of one sandwich and y is cost of one cookie.
