anonymous
  • anonymous
Please Help Me It Is Very IMPORTANT!! :) Thank You
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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
anonymous
  • anonymous
here is the problem 6x - 4y = 54 -9x + 2y = -69
slaaibak
  • slaaibak
You generally look at what method will be the easiest/fastest to do.

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slaaibak
  • slaaibak
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
precal
  • precal
I would do elimination but Cramer's rule is one of the fastest way to solve the system
anonymous
  • anonymous
Thank You but you can please help me on the problem too
anonymous
  • anonymous
Can you also tell what you did like step by step please and thank you :)
slaaibak
  • slaaibak
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
anonymous
  • anonymous
you know how like on the second thing that you did well what goes in the middle of 6x - 4y
anonymous
  • anonymous
I can just use this and this is correct right??
slaaibak
  • slaaibak
nothing, I just spaced it so it is kinda in the same line of sight
slaaibak
  • slaaibak
yes, you can. It's correct.
anonymous
  • anonymous
thank you soo much
anonymous
  • anonymous
wait what proccess is this??
anonymous
  • anonymous
substittution??? haha i spelled it wrong lol
slaaibak
  • slaaibak
Nope this is elimination. My pleasure
anonymous
  • anonymous
Okay thank you

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