Robby has 9 coins that total $2.15. if he only has nickels and dimes, write the system of equations.

Let's assume

number of nickels =n

number of dimes =d

we are given

total number of coins =9

so, we get

we know that

1 nickel =$ 0.05

and

1 dimes =$0.10

so, total amount is

we are given

total amount =$2.15

so, we get

so, we get system of equations as

................Answer

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