Music CD's cost $9 each, and movies cost $10 each. If you spend $78 and buy 8 items, how many of each did you buy?

2 CDs and 6 movies

Step-by-step explanation:

Let the number of CD you bought be x, and the number of movies you bought be y.

Since you bought 8 items in total,

x + y = 8 (1)

The sum of money spent is 78, so

9x + 10y = 78 (2)

From equation (1),

x = 8 - y (3)

Substitute (3) into (2),

9 (8-y) + 10y = 78

72 - 9y + 10y = 78

- 9y + 10y = 78-72

y = 6

Now substitute y=6 into (3).

x = 8 - y

x = 8-6

x = 2

Therefore, you bought 2 CDs and 6 movies.

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step-by-step explanation:

what chart am i supposed to follow?