Apiggy bank contains $5.60 in nickels and dimes. the number of nickels is 8 less than 3 times the dimes. how many nickels and dimes are there in the piggy bank?

10d+5n=560  and n=3d-8, using this n in the first equation gives you:

10d+5(3d-8)=560

10d+15d-40=560

25d-40=560

25d=600

d=24, and since n=3d-8

n=3(24)-8

n=72-8

n=64

So there are 24 dimes and 64 nickels in the piggy bank.

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8