Question 1051522: Isaiah has 7.15 in dimes and nickels. He has a total of 91 coins
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! x=dimes
y=nickels
x+y=91; that is a count of the coins.
.10x+.05y=7.15; this is a count of the money
multiply the bottom by -20, to make the second term -1 y, because then we can eliminate y
-2x-y=-143.0
-x=-52
y=52 dimes or $5.20
x=39 nickels or $1.95
They sum to $7.15.
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