7 audio cassettes and 3 video cassettes cost Rs. 1110, while 5 audio cassettes and 4 video cassettes cost Rs. 1350. Find the cost of an audio cassette and a video cassette.

Explanation

To solve the problem, we need to set up a system of linear equations based on the information provided. Let's denote:

- \( x \) as the cost of one audio cassette.
- \( y \) as the cost of one video cassette.

From the problem statement, we can create the following equations based on the costs given:

1. From the first statement:
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