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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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  1. AriPotta Group Title
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    5n + 10d = 330 n + d = 42

    • one year ago
  2. liza2 Group Title
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    n is the number of nickels and d is the number of dimes.

    • one year ago
  3. AriPotta Group Title
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    so you gotta use the second equation to solve for d

    • one year ago
  4. AriPotta Group Title
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    or n, but i would do d

    • one year ago
  5. AriPotta Group Title
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    so what does d equal?

    • one year ago
  6. El_Pollo Group Title
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    D=576

    • one year ago
  7. AriPotta Group Title
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    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
  8. AriPotta Group Title
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    and then you can substitute 42 - n for d in the first equation

    • one year ago
  9. AriPotta Group Title
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    so 5n + 10d = 330 would be 5n + 10(42 - n) = 330. is this making sense?

    • one year ago
  10. El_Pollo Group Title
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    Yes, but we have to have a system of equations

    • one year ago
  11. AriPotta Group Title
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    the first thing i posted was our system of equations

    • one year ago
  12. AriPotta Group Title
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    now we're solving it

    • one year ago
  13. El_Pollo Group Title
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    Oh right sorry

    • one year ago
  14. AriPotta Group Title
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    so do you know what to do from there? from 5n + 10(42 - n) = 330?

    • one year ago
  15. El_Pollo Group Title
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    ok

    • one year ago
  16. El_Pollo Group Title
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    so just distribute and then solve from there?

    • one year ago
  17. AriPotta Group Title
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    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
  18. El_Pollo Group Title
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    i get a negative

    • one year ago
  19. AriPotta Group Title
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    |dw:1349754629184:dw|

    • one year ago
  20. AriPotta Group Title
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    does that make sense?

    • one year ago
  21. El_Pollo Group Title
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    yes i see were i made my mistake i forgot the negative sign

    • one year ago
  22. AriPotta Group Title
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    so now we know that 18 + d = 42 and we can solve for d

    • one year ago
  23. El_Pollo Group Title
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    right plug in 18 in the n part

    • one year ago
  24. AriPotta Group Title
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    yup, so how many dimes are there?

    • one year ago
  25. El_Pollo Group Title
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    there's 24

    • one year ago
  26. AriPotta Group Title
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    yep :) 24 dimes and 18 nickels

    • one year ago
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