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alexdok [17]
3 years ago
7

 Tim​'s piggy bank contains dimes and nickels worth ​$5.50. He has 70 coins in all. Use substitution to solve the system of equa

tions to find out how many of each coin Tim has.
Mathematics
1 answer:
Illusion [34]3 years ago
7 0
5.50=0.10d+0.05n
70=d+n

how to solve-
n=70-d
5.50=0.10d+0.05(70-d)
5.50 = 0.10d +3.5 -0.05d
5.50= 0.05d+3.5
2=0.05d
d=40

70=d+n
70=40+n
n=30

there are 40 dimes and 30 nickels
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