Posted by Angie on Monday, April 20, 2009 at 6:06pm.
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  TchrWill, Tuesday, April 21, 2009 at 9:50am
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.
1n+d=21
210d+5n=170
3From (1), d=21n
4Substitute into (2) and solve for n and then d.

Math  Angie, Tuesday, April 21, 2009 at 6:40pm
i get it..thanks!
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