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12 May, 18:47

Imagine having 20 currency notes, consisting of $5 bills, and $10 bills that total $125. Write a system of equations to describe the situation.

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Answers (2)
  1. 12 May, 20:37
    0
    Hi,

    Reading the problem you can understand that you have 20 currency notes. So, all the currency notes (5 and 10) summed are 20.

    Now, you know that there are some 5 and 10 bills of these, but you don't know how many of these are $5 or $10 ... you only know that summing all these bills give $125.

    Setting a sistem of linear equation would be like this:

    i call x the $5 bills and y the $10 bills.

    x+y = 20

    5x + 10y = 125

    The final results are x = 15 and y = 5

    Hope it is clear!
  2. 12 May, 22:26
    0
    X-the $5 bills

    y-the $10 bills

    x+y=20

    5x+10y=120

    It's a system.
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