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GabriellaGurl101

Please Help Me It Is Very IMPORTANT!! :) Thank You

  • one year ago
  • one year ago

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  1. GabriellaGurl101
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    When solving systems of equations, how do you determine what method to use? For the next can you please help me solve it and what all you did please

    • one year ago
  2. GabriellaGurl101
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    here is the problem 6x - 4y = 54 -9x + 2y = -69

    • one year ago
  3. slaaibak
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    You generally look at what method will be the easiest/fastest to do.

    • one year ago
  4. slaaibak
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    With that equation, you can see that the y coefficients are two and 4. So, it looks like a minor effort to just multiply the one equation by two, and adding them together to eliminate the y-variable

    • one year ago
  5. precal
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    I would do elimination but Cramer's rule is one of the fastest way to solve the system

    • one year ago
  6. GabriellaGurl101
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    Thank You but you can please help me on the problem too

    • one year ago
  7. GabriellaGurl101
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    Can you also tell what you did like step by step please and thank you :)

    • one year ago
  8. slaaibak
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    Sure. First multiply the second equation by 2: x2: -9x + 2y = -69 ---> -18x + 4y = -138 List the two equations and add: 6x -4y = 54 -18x + 4y = -138 __________________ -12x + 0y = -84 -12x = -84 x = 7 Now sub x back into any of the equations: 6(7) - 4y = 54 42 - 4y = 54 4y = - 12 y = -3 so x=7 and y = -3

    • one year ago
  9. GabriellaGurl101
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    you know how like on the second thing that you did well what goes in the middle of 6x - 4y

    • one year ago
  10. GabriellaGurl101
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    I can just use this and this is correct right??

    • one year ago
  11. slaaibak
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    nothing, I just spaced it so it is kinda in the same line of sight

    • one year ago
  12. slaaibak
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    yes, you can. It's correct.

    • one year ago
  13. GabriellaGurl101
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    thank you soo much

    • one year ago
  14. GabriellaGurl101
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    wait what proccess is this??

    • one year ago
  15. GabriellaGurl101
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    substittution??? haha i spelled it wrong lol

    • one year ago
  16. slaaibak
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    Nope this is elimination. My pleasure

    • one year ago
  17. GabriellaGurl101
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    Okay thank you

    • one year ago
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