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A piggy bank contains 70 coins. The coins are dimes and nickels worth $5.50. Use substitution to solve the system of equations to find out how many dimes and nickels are in the piggy bank.

A piggy bank contains 70 coins The coins are dimes and nickels worth 550 Use substitution to solve the system of equations to find out how many dimes and nicke class=

Respuesta :

ohorowitz

Answer:

There are 40 dimes and 30 nickels :)

Step-by-step explanation:

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