Question 30712
Let the dimes be x
Let the nickels be y
x+y=8
y=8-x (subsitution)
DDime value x 100 = 10
Nickel value x 100 = 5
TOtal value x 100 = 70


Equation:
10x+5y=70
10x+5(8-x)=70
10x-5x=70-40
5x=30
x=6


y=8-6
y=2


<font color = blue>Hence, there are 6 dimes and 2 nickels</font>.
Paul.