Question
Write a system of equations to describe the situation below, solve using elimination, and fill in the blanks. Today's cafeteria specials at a high school in Middletown are a deluxe turkey sandwich and a chef salad. During early lunch, the cafeteria sold 21 turkey sandwiches and 17 chef salads, for a total of 110 During the late lunch 12 turkey sandwiches and 56 chef salads were sold, for a total of 248 How much does each item cost? A turkey sandwich costs and a chef salad costs
Solution
4.7
(232 Votos)
Agnetha
Veterano · Tutor por 10 anos
Resposta
To solve this problem, we need to set up a system of equations based on the information given. Let's define the variables first:- Let
be the cost of a turkey sandwich.- Let
be the cost of a chef salad.We can then write the following system of equations based on the sales during early and late lunch:1. For early lunch:
2. For late lunch:
Now we will solve this system using the elimination method.First, we need to make the coefficients of one of the variables the same in both equations. We'll eliminate
by finding a common multiple for the coefficients of
in both equations. The least common multiple of 21 and 12 is 84.We will multiply the first equation by 4 and the second equation by 7 to make the coefficients of
equal:
Now we subtract the first modified equation from the second modified equation to eliminate
:
Now that we have the value of
, we can substitute it back into one of the original equations to solve for
. We'll use the first equation:
So, the cost of a turkey sandwich is
.A turkey sandwich costs
.