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Shawntee has 21 coins all of them nickel and dimes that are worth $1.70. Write a system of equations and splve
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Shawntee has 21 coins all of them nickel and dimes that are worth $1.70. Write a system of equations and splve
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Mar 20, 2018
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Shawntee has 21 coins all of them nickel and dimes that are worth $1.70. Write a system of equations and splve
Mathematics
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Ebonique
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Ebonique
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n+d=21
5n+10d=170
so
multiply first equation by -5 and add to other one
-5n-5d=-105
5n+10d=170 +
0n+5d=65
5d=65
divide both sides by 5
d=13
sub back
n+d=21
n+13=21
minus 13 both sides
n=8
8nickles
13 dimes
Reena Shirale
answered
Mar 24, 2018
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Reena Shirale
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