Question

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

Answer 1

Let's assume

number of nickels =n

number of dimes =d

we are given

total number of coins =9

so, we get

$n+d=9$

we know that

1 nickel =$ 0.05

and

1 dimes =$0.10

so, total amount is

$=0.05\times n +0.10\times d$

we are given

total amount =$2.15

so, we get

$0.05n +0.10d=2.15$

so, we get system of equations as

$n+d=9$

$0.05n +0.10d=2.15$................Answer