Coco has a jar containing pennies and nickles. There is $9.20 worth of coins in the jar. If she could switch the number of pennies with the number of nickles, there would be $26.80 worth of coins in the jar. How many pennies and nickles are in the jar?

Answer 1

X pennies, and Y nickels.

Eq1: 1x + 5y = 920 cents.
Eq2: 5x + 1y = 2680 cents.

-5x - 25y = -4600
+5x + 1y = 2680
Sum: -24y = -1920
Y = 80 nickels.

In Eq1, replace Y with 80:
x + 5*80 = 920, X = 520 Pennies.

Answer 2

why did it become negatives?

Answer 3

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