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Kitkat1

  • one year ago

A system of equations is shown below: n = 3m + 7 n – 2m = 1 What is the solution, in the form (m, n), to the system of equations?

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  1. Kitkat1
    • one year ago
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    I will give medals!

  2. pooja195
    • one year ago
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    Use substituion

  3. anonymous
    • one year ago
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    By the first equation what is n in terms of m?

  4. pooja195
    • one year ago
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    \[\huge~(3m + 7)– 2m = 1\]

  5. pooja195
    • one year ago
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    I put equation 1 into equation 2

  6. pooja195
    • one year ago
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    Now solve that :)

  7. Kitkat1
    • one year ago
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    What do I do next?

  8. pooja195
    • one year ago
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    Solve that get the m value then plug the m value into equation 1

  9. Kitkat1
    • one year ago
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    how can I combine the like terms?

  10. Kitkat1
    • one year ago
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    I dont know what to do

  11. pooja195
    • one year ago
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    3-2=?

  12. Kitkat1
    • one year ago
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    1

  13. pooja195
    • one year ago
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    1m+7=1 subtract 7 from both sides

  14. Kitkat1
    • one year ago
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    1m= -6

  15. pooja195
    • one year ago
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    good now divide :) -6/1=?

  16. Kitkat1
    • one year ago
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    -6

  17. pooja195
    • one year ago
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    good so we have m=-6 n=3(-6)+7

  18. Kitkat1
    • one year ago
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    -18=7 ?

  19. pooja195
    • one year ago
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    no -18+7-?

  20. Kitkat1
    • one year ago
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    -11

  21. pooja195
    • one year ago
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    good so we have m=-6 n=-11

  22. Kitkat1
    • one year ago
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    but whats the answer then?

  23. pooja195
    • one year ago
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    Well thats for u to figure out. We did all the work \[\huge~m=-6~~~~~~ n=-11\]

  24. Kitkat1
    • one year ago
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    okay can u help me with one more?

  25. Kitkat1
    • one year ago
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    A pencil at a stationery store costs $1, and a pen costs $1.50. Stella spent $21 at the store. She bought a total of 18 items. Which system of equations can be used to find the number of pencils (x) and pens (y) she bought? (5 points) 1.5x + y = 21 x = 18y 18x + y = 21 x = 1.5y x + 1.5y = 21 x + y = 18 x + 18y = 21 x = 1.5y

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