Question 1009646
 I have 20 coins consisting of nickels and dimes. Their total value is $1.30. How many are nickels and how many are dimes. I need two equations so I can do systems of equations 
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Quantity Eq:: n + d = 20 coins
Value Eq:::: 5n +10d = 130 cents
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Modify the Value Eq for elimination of one of the variables::
n + d = 20
n + 2d = 26
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Subtract and solve for "d"::
d = 6 (# of dimes)
n = 20-6 = 14 (# of nickels)
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Cheers,
Stan H.