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Question: hello my previous question resulted in two linear equations 50x...

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Hello, my previous question resulted in two linear equations:

  1. 50x + 500y = 40  (50GB of data + 500 minutes of talk time = $40)
  2. 60x + 400y = 42  (60GB of data + 400 minutes of talk time = $42)

Let x be GB of data used and let y be minutes of talk time.

I've solved these by substitution to find the intercept (1/2, 3/100). 

The next question is: give the charges for each GB of data and for each minute of calls. 

What equation should I use to solve this? 

Thanks again! 

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