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10) Ten sandwiches were purchased at a total cost of $18,50. Some are tuna sandwiches which are $2.00 each,
and the rest are cheese sandwiches which are $1,50 cach. How many of each kind were purchased?
Whoever answers this question will be the brainliest!!

Respuesta :

Answer:

Tuna sandwiches cost $1.83 and cheese sandwiches cost $9.9.

Step-by-step explanation:

x + y = 10

2x + 1.5y = 18.5

Multiply the first equation by -2 to eliminate x

-2x - 3y = -20

2x + 1.5y = 5.15

x cancels out and then add

       -1.5y = -14.85

            y = 9.9; therefore, cheese sandwiches cost $9.9.

Find x with the original second equation

2x + 1.5y = 18.5

2x + 1.5(9.9) = 18.5

2x + 14.85 = 18.5

2x = 18.5 - 14.85

2x = 3.65

 x = 1.83; therefore, tuna sandwiches cost $1.83.

hope it helps :)

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