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How can I solve this simultaneously?

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Manager
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How can I solve this simultaneously?  [#permalink]

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New post 26 Jul 2018, 06:26
The question says:
Solve the following simultaneously:

1.) 3x-y+12 = 5x+2y+4 = x-y


Answer: x=-6, y=20/3

Thanks a lot!

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Re: How can I solve this simultaneously?  [#permalink]

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New post 26 Jul 2018, 06:37
1
I am not sure what you meant by simultaneously but here is how I would solve it.

3x-y+12 = 5x+2y+4 = x-y

=> 3x-x-y+y+12 = 5x-x+2y+y+4 = 0

=> 2x+12 = 4x+3y+4 = 0

=> 2x+12 = 0 and 4x+3y+4 = 0

=> x = -6 and -24+3y+4 = 0

=> x = -6 and 3y-20 = 0

=> x = -6 and y = \(\frac{20}{3}\)
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Re: How can I solve this simultaneously?  [#permalink]

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New post 26 Jul 2018, 08:34
Thank you very much!

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Re: How can I solve this simultaneously? &nbs [#permalink] 26 Jul 2018, 08:34
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