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Alex73 [517]
4 years ago
9

Here is a system of linear equations:

Mathematics
1 answer:
konstantin123 [22]4 years ago
3 0

Step-by-step explanation:

6x + 21y = 103

-6x + 23y = 51

The signs of the x coefficients are opposite.  So adding the equations will eliminate the x terms.

44y = 154

y = 3.5

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Let's assume two variables x and y which represent the local and international calls respectively. 

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