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In 1990 it would have cost $3.70 to send 13 postcards and 7 letters. It would have cost $2.65 to send 6 postcards and 7 letters. How much did it cost to send a letter in 1990?
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In 1990 it would have cost $3.70 to send 13 postcards and 7 letters. It would have cost

$2.65 to send 6 postcards and 7 letters. How much did it cost to send a letter in 1990?

User Abhishek Baranwal
by
7.7k points

1 Answer

5 votes

Answer:

$0.37

Explanation:

This can be solved by solving a system of linear equations that is shown above.

In 1990 it would have cost $3.70 to send 13 postcards and 7 letters. It would have-example-1
User The Senator
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