Question 852087
X=NICKELS.
Y=80-X DIMES.
.05X+.10Y=6.20
.05X+.10(80-X=6.20
.05X+8-.10X=6.20
-.05X=6.20-8.00
-.05X=-1.80
X=-1.80/.05
X=36 NICKELS.
Y=80-36=44 DIMES.
PROOF:
.05*36+.10*44=6.20
1.80+4.40=6.20
6.20=6.20