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mariannu Group Title

Solve the linear system using elimination. Hello you guys. I just want to know how you flip it. 2x - y= -11 y = -2x -13

  • one year ago
  • one year ago

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  1. Mertsj Group Title
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    rewrite the second equation by adding 2x to both sides.

    • one year ago
  2. chrismoon Group Title
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    for the second equation \[y=-2x-13\] you already solved for y. plug that y into the first equation, giving you\[2x-(-2x-13)=-11\]

    • one year ago
  3. mariannu Group Title
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    Don't get it.

    • one year ago
  4. mariannu Group Title
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    :p

    • one year ago
  5. Mertsj Group Title
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    So chrismoon, you are instructing the asker to ignore the directions which say to solve using elimination?????

    • one year ago
  6. mariannu Group Title
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    ALl I just want to know is just how to flip it. and thats it.

    • one year ago
  7. Mertsj Group Title
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    @mariannu Do what I said and then add the two equations to eliminate y from the system

    • one year ago
  8. Mertsj Group Title
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    What do you mean by flip it?

    • one year ago
  9. mariannu Group Title
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    So its y + 2x = -11???

    • one year ago
  10. Mertsj Group Title
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    |dw:1361938190124:dw|

    • one year ago
  11. mariannu Group Title
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    Ok that makes more sense thank you! ^.^ for the help. So I just do that for other equations like that right?

    • one year ago
  12. Mertsj Group Title
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    Do you mean other systems?

    • one year ago
  13. Mertsj Group Title
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    If so, the answer is yes.

    • one year ago
  14. mariannu Group Title
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    Ok, thank you much!!! ^.^ lol

    • one year ago
  15. Mertsj Group Title
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    yw

    • one year ago
  16. chrismoon Group Title
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    You're given two things: Equation 1)\[2x-y=-11\]Equation 2) \[y=-2x-13\] Equation 2 tells you what y is already. You can put what y equals (-2x-13 in this case) into the first equation for y. Equation 1 goes from \[2x-y=-11\] to \[2x-(-2x-13)=-11\] since\[y=-2x-13\] Simplify your Equation 1 from \[2x-(-2x-13)=-11\] to \[2x+2x+13=-11\]giving you \[4x=-24\] divide both sides by 4 to solve for x \[x=-6\] Now that you have solved for x, go all the way back to the original Equation 2\[y=-2x-13\] Since we know what x is now, plug it in\[y=-2(-6)-13\]giving us \[y=-1\] There you have it: \[y=-1\]and \[x=-6\]

    • one year ago
  17. Mertsj Group Title
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    @chrismoon Why do you keep telling the asker to ignore the directions given?

    • one year ago
  18. chrismoon Group Title
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    Sorry, didn't see you guys already talked about it before I posted. Didn't get notified you guys got it taken care of.

    • one year ago
  19. Mertsj Group Title
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    @chrismoon The problem says to solve by elimination. You keep telling the asker to use substitution.

    • one year ago
  20. chrismoon Group Title
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    Guess I didn't read the question very thoroughly. My bad.

    • one year ago
  21. mariannu Group Title
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    That is ok. As you try to help. but thanks

    • one year ago
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