SOLUTION: Thanks for your help by seeing your answer worked out I'm learning by solving linear equations. A jar contains 20 coins, all dimes and nickels. Their value is 1.75 how many nick

Question 183824: Thanks for your help by seeing your answer worked out I'm learning by solving linear equations.
A jar contains 20 coins, all dimes and nickels. Their value is 1.75 how many nickels in the jar?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
N+D=20 OR N=20-D
.05N+.10D=1.75
.05(20-D)+.10D=1.75
1-.05D+.10D=1.75
.05D=1.75-1
.05D=.75
D=.75/.05
D=15 IS THE NUMBER OF DIMES.
20-15=5 IS THE NUMBER OF NICKELS.
PROOF
.05*5+.10*15=1.75
.25+1.50=1.75
1.75=1.75
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