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Taylor swift is selling digital and hard copies of her newest album. if she sells 13 hard copies and 7 digital copies the total is 107$. if Taylor sells 7 hard copies and 7 digital copies the total is 77$ find the cost of Taylor swift's
digital album​

Respuesta :

Answer:

6$

Step-by-step explanation:

one digital album costs x, one hard copy costs y

then

7x + 13y = 107    (1)

7x + 7y = 77       (2)

(2) - (1): 6y = 30, y = 5

From (2): x + y = 77/7 = 11

so x = 11 - y = 11 - 5 = 6

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