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5n + 10d = 330
n + d = 42

n is the number of nickels and d is the number of dimes.

so you gotta use the second equation to solve for d

or n, but i would do d

so what does d equal?

D=576

and then you can substitute 42 - n for d in the first equation

so 5n + 10d = 330 would be 5n + 10(42 - n) = 330.
is this making sense?

Yes, but we have to have a system of equations

the first thing i posted was our system of equations

now we're solving it

Oh right sorry

so do you know what to do from there? from 5n + 10(42 - n) = 330?

ok

so just distribute and then solve from there?

i get a negative

|dw:1349754629184:dw|

does that make sense?

yes i see were i made my mistake i forgot the negative sign

so now we know that 18 + d = 42 and we can solve for d

right plug in 18 in the n part

yup, so how many dimes are there?

there's 24

yep :) 24 dimes and 18 nickels