Question

a post office always charges a flat one time fee for any order. one time, michael sent 35 letters and paid 26 dollars. the next time, he sent 18 letters and paid $14.10. how much does the post office charge to send one letter? what is the flat fee?

Answers

  1. Answer:
    $0.70 per letter, $1.50 flat fee
    Step-by-step explanation:
    x+18y=14.1 -> x=-18y+14.1
    x+35y=26
    |
    \/
    (-18y+14.1)+35y=26 -> 17y=11.9 -> y=0.7
    |
    \/
    x+35(0.7)=26 -> x+24.5=26 -> x=1.5
    |
    \/
    y=0.7
    x=1.5
    Hope this helps. 🙂

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