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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asked Apr 16, 2022 50.8k views

2 votes

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?

Mathematics
high-school

Abhishek Baranwal asked

by Abhishek Baranwal

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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

The Senator answered Apr 23, 2022

by The Senator

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