Question 971695
will do with 2 variables.

n+d=200
.05 n + .10 d= 14.00

n=200-d

.05 (200-d) +.10d=14.00

10.00-.05d +.10d=14.00

.05d =4.00, by collecting terms
5d=400  after multiplying by 100.
d=80
n=120

120*.05 =$6 for nickels
80 dimes=$8
Total $14