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malutella

Solve these systems of equations 7x+2y= -3 and -14x-4y=6 . I got y=3/2, x= -6/7 am I right ?

  • one year ago
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  1. AravindG
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    hmm multiply first equation with 2

    • one year ago
  2. AravindG
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    14x+4y=-6

    • one year ago
  3. AravindG
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    14x+4y+6=0

    • one year ago
  4. malutella
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    well yeah i did that multiplying it by -2 so that when i add it in the second question -14x and 14X cancel out (I'm using linear combinations here)

    • one year ago
  5. AravindG
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    -14x+4y-6=0

    • one year ago
  6. malutella
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    *equation

    • one year ago
  7. AravindG
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    if thats the case both x and y cancels out!!

    • one year ago
  8. AravindG
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    isnt it?

    • one year ago
  9. malutella
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    In the first equation you do 2y times -2 = -4y. Now in the 2nd equation you have -4y soo -4y+ -4y is -8y which means that the ys don't cancel out

    • one year ago
  10. AravindG
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    nt really :)

    • one year ago
  11. AravindG
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    infact both these lines are the same !!

    • one year ago
  12. AravindG
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    take a look at the graph

    • one year ago
  13. AravindG
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    http://www.wolframalpha.com/input/?i=solve+7x%2B2y%3D+-3++and+-14x-4y%3D6

    • one year ago
  14. malutella
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    yes I see...so there's something I'm doing wrong in my math here !

    • one year ago
  15. malutella
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    u were right they are the same line!

    • one year ago
  16. AravindG
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    take a look at the question you have posted !!

    • one year ago
  17. AravindG
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    :P yep makes sure u type the qns right :)

    • one year ago
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