anonymous
  • anonymous
Use elimination to solve the system. What is the value of x? 4x + 7y = -14 and 8x + 5y = 8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jim_thompson5910
  • jim_thompson5910
Hint: Multiply everything in the first equation by -2 to go from 4x + 7y = -14 to -8x - 14y = 28
jim_thompson5910
  • jim_thompson5910
So you now have the two equations -8x - 14y = 28 8x + 5y = 8
anonymous
  • anonymous
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.

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More answers

jim_thompson5910
  • jim_thompson5910
you can go a number of ways, you can multiply the top equation by 5 and the bottom equation by -7, then add
anonymous
  • anonymous
im just getting more confused
anonymous
  • anonymous
I believe the answer is -14.
anonymous
  • anonymous
these are the options. 3.5 -1.5 8 -4
anonymous
  • anonymous
Oh then i bet the answer is -5
jim_thompson5910
  • jim_thompson5910
Do you see how I went from 4x + 7y = -14 to -8x - 14y = 28
jim_thompson5910
  • jim_thompson5910
it's not -5
jim_thompson5910
  • jim_thompson5910
please don't give away the (incorrect) answer
anonymous
  • anonymous
sorry, if you would just give her the right answer, i would be able to go on with my day. As would she
jim_thompson5910
  • jim_thompson5910
I'm providing hints and trying to walk her through it (without giving it all away)
anonymous
  • anonymous
No matter how many hints your provide she doesn't care. she just wants the answer
jim_thompson5910
  • jim_thompson5910
well that's not what this site is for, I'm sry
jim_thompson5910
  • jim_thompson5910
if you keep this behavior up jefferyflow123go you will be reported (and possibly suspended/banned)
anonymous
  • anonymous
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
jim_thompson5910
  • jim_thompson5910
its ok, you don't have to understand everything at once katie2212
anonymous
  • anonymous
but i have to understand if i want to finishe this exam.
anonymous
  • anonymous
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.
jim_thompson5910
  • jim_thompson5910
that's not helping though, you may think it is...but it's not
jim_thompson5910
  • jim_thompson5910
if you want, you can provide the steps so she can learn from them
anonymous
  • anonymous
okay will you guys please stop arguing and just help me!
jim_thompson5910
  • jim_thompson5910
ok I'll give steps on this one and hopefully it will be enough to answer similar ones, sound good?
anonymous
  • anonymous
IS your refrigderator running ? IF SO GO CATCH IT
anonymous
  • anonymous
yes thank you
anonymous
  • anonymous
My momma once told me, a fast runna' is the best runnna'
anonymous
  • anonymous
jeffery if youre not going to help please get out.
anonymous
  • anonymous
BUT IM JUST TRYNA HELP YOU. ILL CATCH YOUR FRIDGE FR YOU.
anonymous
  • anonymous
What did the bison say to his son when he left for college? Bi-son
jim_thompson5910
  • jim_thompson5910
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
anonymous
  • anonymous
IM SO PUN-NY
anonymous
  • anonymous
IM A MaTH WIZ
anonymous
  • anonymous
Thank you Jim
anonymous
  • anonymous
yanno wizard like Harry Potter
jim_thompson5910
  • jim_thompson5910
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
jim_thompson5910
  • jim_thompson5910
then you use that value of y to find x
jim_thompson5910
  • jim_thompson5910
you've been reported jefferyflow123go, have a nice day
anonymous
  • anonymous
you too good sir(:
jim_thompson5910
  • jim_thompson5910
good luck with that one, I don't spam and harass others so your claim will be without merit

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