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El_Pollo
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Solve using a system of equations:
There is a collection of nickels and dimes worth $3.30. There are 42 coins in all. How many are there of each kind?
 one year ago
 one year ago
El_Pollo Group Title
Solve using a system of equations: There is a collection of nickels and dimes worth $3.30. There are 42 coins in all. How many are there of each kind?
 one year ago
 one year ago

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AriPotta Group TitleBest ResponseYou've already chosen the best response.1
5n + 10d = 330 n + d = 42
 one year ago

liza2 Group TitleBest ResponseYou've already chosen the best response.0
n is the number of nickels and d is the number of dimes.
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
so you gotta use the second equation to solve for d
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
or n, but i would do d
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
so what does d equal?
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
no, what you gotta do it find out what d is compared to n. so it's n + d = 42. what you do with that is subtract n from both sides to get d = 42  n
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
and then you can substitute 42  n for d in the first equation
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
so 5n + 10d = 330 would be 5n + 10(42  n) = 330. is this making sense?
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
Yes, but we have to have a system of equations
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
the first thing i posted was our system of equations
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
now we're solving it
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
Oh right sorry
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
so do you know what to do from there? from 5n + 10(42  n) = 330?
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
so just distribute and then solve from there?
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
yea, distribute the 10 into the parentheses and then solve for n and once you know how many nickels there are, just substitute that for n in the second equation and solve for d
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
i get a negative
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
dw:1349754629184:dw
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
does that make sense?
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
yes i see were i made my mistake i forgot the negative sign
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
so now we know that 18 + d = 42 and we can solve for d
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
right plug in 18 in the n part
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
yup, so how many dimes are there?
 one year ago

El_Pollo Group TitleBest ResponseYou've already chosen the best response.0
there's 24
 one year ago

AriPotta Group TitleBest ResponseYou've already chosen the best response.1
yep :) 24 dimes and 18 nickels
 one year ago
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