Joe's pizza charges $ 12.00 per large pizza plus a flat $ 4.00 delivery fee . decide which of the following represent the relationship between number of large pizzas, x, and the cost of delivery, y ? A . y = 16x . B .y = 12x + 4 . C .y = 4x + 12 . D. y = 12x . PLz help

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

Bis the !