anonymous
  • anonymous
Solve using two differemt methods. Explain which method you found to be more efficient. a. 3x-9y=3 6x - 3y= -24
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
The two methods are elimination and substitution.
anonymous
  • anonymous
There is also graphing
skullpatrol
  • skullpatrol
What have you tried?

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anonymous
  • anonymous
Nothing yet, i know how to do elimination. But i dont know how to substitution or graphing.
skullpatrol
  • skullpatrol
Use elimination and find the answer first. All the methods should give the same answer, right?
anonymous
  • anonymous
Ok
skullpatrol
  • skullpatrol
$$ 3x-9y=3$$ $$ 6x - 3y= -24$$
anonymous
  • anonymous
I got 3x-6y= -27 but i dont think its rigth is it?
skullpatrol
  • skullpatrol
No.
anonymous
  • anonymous
oh
anonymous
  • anonymous
well, how do i do it?
anonymous
  • anonymous
Do it simultaneously.
skullpatrol
  • skullpatrol
You said you know how to use elimination. Try multiplying the first equation by $$-2$$ and add it to the second equation...
skullpatrol
  • skullpatrol
$$ (3x-9y=3) (-2)$$ 6x - 3y= -24
anonymous
  • anonymous
\[3x-9y=3 [1]\] \[6x - 3y= -24 [2]\] \[2\times [1]\] \[6x-18y=6 [3]\] \[[2]-[3]\] \[(6x - 3y) - (6x-18y)= (-24)-(6)\]
anonymous
  • anonymous
\[-3y+18y=-30\] The x's cancel out. Now you can solve for y. Once you solve for y, you can then substitute the y component that you just found, into any one of the equations above to find your x-value.
anonymous
  • anonymous
If you need further assistance, I will be happy to elaborate it in more simple terms.

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