VIKING2108
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- Jul 29, 2019
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Solve for A, B and C:
A+B+2C=-5
-2A-4C=-2
-3A+B=3
Can someone please explain this to me, thanks.
A+B+2C=-5
-2A-4C=-2
-3A+B=3
Can someone please explain this to me, thanks.
Elimimation
- Thread starter VIKING2108
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Dr.Peterson
Elite Member
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- Nov 12, 2017
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I presume you were told to solve this system of equations by "elimination", which usually means combining pairs of equations by adding multiples of them.
One way you might start is to combine the first two by adding twice the first to the second, to eliminate C. Then you can combine the resulting equation with the third, to eliminate either A or B, whichever you like.
In fact, when I do that, I find that I have already solved for B before I use the third equation. Perhaps this is where you are confused: It's "too easy"! Once you have B, just find A from the third, and C from the second, for example.
Please show whatever you are able to do, so we can see at what point you are stuck.
One way you might start is to combine the first two by adding twice the first to the second, to eliminate C. Then you can combine the resulting equation with the third, to eliminate either A or B, whichever you like.
In fact, when I do that, I find that I have already solved for B before I use the third equation. Perhaps this is where you are confused: It's "too easy"! Once you have B, just find A from the third, and C from the second, for example.
Please show whatever you are able to do, so we can see at what point you are stuck.