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mitchelsewbaran

  • 3 years ago

Write a system of equations for the following situation. Sharon has some $1 bills and some $5 bills. She has 14 bills which total to a value of $30.

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  1. Kuoministers
    • 3 years ago
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    let $1 = x and $5 = y ok? so 1x + 5y = 30 now that is one equation

  2. mitchelsewbaran
    • 3 years ago
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    right

  3. Kuoministers
    • 3 years ago
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    any idea what the 2nd one is?

  4. mitchelsewbaran
    • 3 years ago
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    14x+14y=30?

  5. Kuoministers
    • 3 years ago
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    x + y = 14

  6. Kuoministers
    • 3 years ago
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    now we use a method to find x and y? which do you like ^^ elimination? substitution?

  7. mitchelsewbaran
    • 3 years ago
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    the 1st one

  8. Kuoministers
    • 3 years ago
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    awsome (so much easier) x + 5y = 30 x + y = 14 we subtract x from x vertically. 4y = 16

  9. mitchelsewbaran
    • 3 years ago
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    y=4

  10. Kuoministers
    • 3 years ago
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    now i hope you can figure it out. once you find y sub y into the equation

  11. mitchelsewbaran
    • 3 years ago
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    isnt that for the substitution method?

  12. Kuoministers
    • 3 years ago
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    nope

  13. Kuoministers
    • 3 years ago
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    we use the elimination then we sub y into the equation

  14. Kuoministers
    • 3 years ago
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    if we did substitution we would make y the subject then get y THEN we would sub y into equation to get x

  15. mitchelsewbaran
    • 3 years ago
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    which equation should i plug the 4 in for y?

  16. Kuoministers
    • 3 years ago
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    any :)

  17. Kuoministers
    • 3 years ago
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    x + y = 14 would just be easier though

  18. mitchelsewbaran
    • 3 years ago
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    ok ill go for that. I got 10 for x

  19. Kuoministers
    • 3 years ago
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    good so we can conclude x = 10 and y = 4

  20. mitchelsewbaran
    • 3 years ago
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    srry i didn't get the 2nd equation when u asked :(

  21. Kuoministers
    • 3 years ago
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    mhm what equation?

  22. Kuoministers
    • 3 years ago
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    x + y = 14?

  23. mitchelsewbaran
    • 3 years ago
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    yea

  24. Kuoministers
    • 3 years ago
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    well there is some $1 and $5 bills yea... and they add to 14. we said that $1 is x and $5 is y. so x + y is equal to 14.

  25. mitchelsewbaran
    • 3 years ago
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    ok

  26. Kuoministers
    • 3 years ago
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    thank you!!

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