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You have a total of 21 coins, all nickels and dimes. The total value is $1.70. Write and solve a system of equations to find the number of dimes d and the number of nickels n that you have.

I already wrote the equations: n+d=21 and 10d+5n=1.70. But I don't know how to solve it..

  • Math -

    You have a total of 21 coins, all nickels and dimes. The total value is $1.70. Write and solve a system of equations to find the number of dimes d and the number of nickels n that you have.

    I already wrote the equations: n+d=21 and 10d+5n=1.70. But I don't know how to solve it.

    1--n+d=21
    2--10d+5n=170
    3--From (1), d=21-n
    4--Substitute into (2) and solve for n and then d.

  • Math -

    i get it..thanks!

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