SOLUTION: How can I show an equations used for this solution. Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have?

Question 72117: How can I show an equations used for this solution.
Jill has $3.50 in nickels and dimes. If she has 50 coins, how
many of each type of coin does she have?
Answer by checkley75(3666) (Show Source): You can put this solution on YOUR website!
N+D=50 N=50-D
5N+10D=350 NOW SUBSTITUTE (50-D) FOR N IN THIS EQUATION & SOLVE FOR D
5(50-D)+10D=350
250-5D+10D=350
5D=350-250
5D=100
D=20 NUMBER OF DIMES.
N+20=50
N=30 NUMBER OF NICKELS
PROOF
5*30=10*20=350
150+200=350
350=350
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