SOLUTION: If you have 100 nickels and dimes coming to a total of $7, how many nickels and dimes are there?

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Question 431899: If you have 100 nickels and dimes coming to a total of $7, how many nickels and dimes are there?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
nickels------------x Numbers
dimes -----------y Numbers
x+y=100 .............1
5x+10y=700.............2
Eliminate y
multiply (1)by -10
Multiply (2) by 1
-10x-10y=-1000
5x+10y=700
Add the two equations
-5x=-300
/-5
x=60 nickels
plug value of x in (1)
x+y=100
60+y=100
y=100-60
y=40 dimes