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GabriellaGurl101

  • 2 years ago

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

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  1. GabriellaGurl101
    • 2 years ago
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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

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

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

  4. slaaibak
    • 2 years ago
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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

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

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

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

  8. slaaibak
    • 2 years ago
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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

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

  10. GabriellaGurl101
    • 2 years ago
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    I can just use this and this is correct right??

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

  12. slaaibak
    • 2 years ago
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    yes, you can. It's correct.

  13. GabriellaGurl101
    • 2 years ago
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    thank you soo much

  14. GabriellaGurl101
    • 2 years ago
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    wait what proccess is this??

  15. GabriellaGurl101
    • 2 years ago
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    substittution??? haha i spelled it wrong lol

  16. slaaibak
    • 2 years ago
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    Nope this is elimination. My pleasure

  17. GabriellaGurl101
    • 2 years ago
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    Okay thank you

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