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Solve using two differemt methods. Explain which method you found to be more efficient. a. 3x-9y=3 6x - 3y= -24

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The two methods are elimination and substitution.
There is also graphing
What have you tried?

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Nothing yet, i know how to do elimination. But i dont know how to substitution or graphing.
Use elimination and find the answer first. All the methods should give the same answer, right?
$$ 3x-9y=3$$ $$ 6x - 3y= -24$$
I got 3x-6y= -27 but i dont think its rigth is it?
well, how do i do it?
Do it simultaneously.
You said you know how to use elimination. Try multiplying the first equation by $$-2$$ and add it to the second equation...
$$ (3x-9y=3) (-2)$$ 6x - 3y= -24
\[3x-9y=3 [1]\] \[6x - 3y= -24 [2]\] \[2\times [1]\] \[6x-18y=6 [3]\] \[[2]-[3]\] \[(6x - 3y) - (6x-18y)= (-24)-(6)\]
\[-3y+18y=-30\] 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.
If you need further assistance, I will be happy to elaborate it in more simple terms.

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