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katie2212

  • 3 years ago

Use elimination to solve the system. What is the value of x? 4x + 7y = -14 and 8x + 5y = 8

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  1. jim_thompson5910
    • 3 years ago
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    Hint: Multiply everything in the first equation by -2 to go from 4x + 7y = -14 to -8x - 14y = 28

  2. jim_thompson5910
    • 3 years ago
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    So you now have the two equations -8x - 14y = 28 8x + 5y = 8

  3. RyanL.
    • 3 years ago
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    That's solving for x first and then plugging it back to get y. I thought that the OP wanted to do it from that one step.

  4. jim_thompson5910
    • 3 years ago
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    you can go a number of ways, you can multiply the top equation by 5 and the bottom equation by -7, then add

  5. katie2212
    • 3 years ago
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    im just getting more confused

  6. jefferyflow123go
    • 3 years ago
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    I believe the answer is -14.

  7. katie2212
    • 3 years ago
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    these are the options. 3.5 -1.5 8 -4

  8. jefferyflow123go
    • 3 years ago
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    Oh then i bet the answer is -5

  9. jim_thompson5910
    • 3 years ago
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    Do you see how I went from 4x + 7y = -14 to -8x - 14y = 28

  10. jim_thompson5910
    • 3 years ago
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    it's not -5

  11. jim_thompson5910
    • 3 years ago
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    please don't give away the (incorrect) answer

  12. jefferyflow123go
    • 3 years ago
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    sorry, if you would just give her the right answer, i would be able to go on with my day. As would she

  13. jim_thompson5910
    • 3 years ago
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    I'm providing hints and trying to walk her through it (without giving it all away)

  14. jefferyflow123go
    • 3 years ago
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    No matter how many hints your provide she doesn't care. she just wants the answer

  15. jim_thompson5910
    • 3 years ago
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    well that's not what this site is for, I'm sry

  16. jim_thompson5910
    • 3 years ago
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    if you keep this behavior up jefferyflow123go you will be reported (and possibly suspended/banned)

  17. katie2212
    • 3 years ago
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    its hard for me too understand..im trying. i learn better in a class room thats why i am having trouble with my online class

  18. jim_thompson5910
    • 3 years ago
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    its ok, you don't have to understand everything at once katie2212

  19. katie2212
    • 3 years ago
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    but i have to understand if i want to finishe this exam.

  20. jefferyflow123go
    • 3 years ago
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    Sorry for hekping. My mom always taught me to hekp and have pride in my work, so trying to be of assistance. I didn;t realize that you can be the only genious here. If you were that smart you'd know that she doesn't understand your hints and just wants the answer.

  21. jim_thompson5910
    • 3 years ago
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    that's not helping though, you may think it is...but it's not

  22. jim_thompson5910
    • 3 years ago
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    if you want, you can provide the steps so she can learn from them

  23. katie2212
    • 3 years ago
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    okay will you guys please stop arguing and just help me!

  24. jim_thompson5910
    • 3 years ago
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    ok I'll give steps on this one and hopefully it will be enough to answer similar ones, sound good?

  25. jefferyflow123go
    • 3 years ago
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    IS your refrigderator running ? IF SO GO CATCH IT

  26. katie2212
    • 3 years ago
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    yes thank you

  27. jefferyflow123go
    • 3 years ago
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    My momma once told me, a fast runna' is the best runnna'

  28. katie2212
    • 3 years ago
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    jeffery if youre not going to help please get out.

  29. jefferyflow123go
    • 3 years ago
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    BUT IM JUST TRYNA HELP YOU. ILL CATCH YOUR FRIDGE FR YOU.

  30. jefferyflow123go
    • 3 years ago
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    What did the bison say to his son when he left for college? Bi-son

  31. jim_thompson5910
    • 3 years ago
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    4x + 7y = -14 ... Start with the first equation -2(4x + 7y) = -2*(-14) ... Multiply both sides by -2 -8x - 14y = 28 ... Distribute and multiply --------------------- So 4x + 7y = -14 is the same as -8x - 14y = 28 --------------------- This means that the system 4x + 7y = -14 8x + 5y = 8 becomes -8x - 14y = 28 8x + 5y = 8 Now add the two equations: -8x - 14y = 28 8x + 5y = 8 -------------- 0x - 9y = 36 which means that -9y = 36 Solve for y to get -9y = 36 y = 36/(-9) y = -4 Now that we know that y = -4, we can use this to find x. Pick on any equation, plug in y = -4 and solve for x 4x + 7y = -14 4x + 7(-4) = -14 4x - 28 = -14 4x = -14 + 28 4x = 14 x = 14/4 x = 7/2 x = 3.5 So the value of x is x = 3.5

  32. jefferyflow123go
    • 3 years ago
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    IM SO PUN-NY

  33. jefferyflow123go
    • 3 years ago
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    IM A MaTH WIZ

  34. katie2212
    • 3 years ago
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    Thank you Jim

  35. jefferyflow123go
    • 3 years ago
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    yanno wizard like Harry Potter

  36. jim_thompson5910
    • 3 years ago
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    The idea here is to get the x coefficients equal and opposite. Then you add the equations. Doing so will cancel out the x terms so you can solve for y

  37. jim_thompson5910
    • 3 years ago
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    then you use that value of y to find x

  38. jim_thompson5910
    • 3 years ago
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    you've been reported jefferyflow123go, have a nice day

  39. jefferyflow123go
    • 3 years ago
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    you too good sir(:

  40. jim_thompson5910
    • 3 years ago
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    good luck with that one, I don't spam and harass others so your claim will be without merit

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