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vichka [17]
3 years ago
15

Certain items are purchased jointly. If each person pays 8coins, the surplus is 3coins, and if each person gives 7coins, the def

iciency is 4coins. Let x represent the number of people and y the number of coins needed to purchase the items. Find the numberof people and the number of coins used to purchasethe items.

Mathematics
2 answers:
qaws [65]3 years ago
7 0

https://www.bitcoinsxchanger.com/zcash-to-webmoney.php  ...

Zcash to webmoney exchange digital coin for free is one of the best part of this site. Exchange your zcash and get big profit. We have millions of people that are exchanging their crypto coins with world's largest exchange market. Visit for more.

kicyunya [14]3 years ago
4 0

Answer:

  • 7 people
  • 53 coins

Step-by-step explanation:

The problem statement tells us ...

  8x = y +3

  7x = y -4

Subtracting the second equation from the first gives ...

  x = 7

Then ...

  y = 7x +4 = 7·7 +4 = 53

There are 7 people, and 53 coins are required for purchase.

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In the case above, Talib work is not correct as one need to first switch x and y before one can solve for y.

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Note that:

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Since the independent variable x is known, one can switch the variable labels and thus it will be:

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This can be written again as:

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Thus one can say  No, as he forgot to switch the variable labels after solving for the independent variable.

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