anonymous
  • anonymous
x - y = 10 2x + y = 2 Can you show your work so I know what I did wrong?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
You need to get each variable on separate sides
AccessDenied
  • AccessDenied
What did you get as an answer?
anonymous
  • anonymous
I got 4, -5. But my sister said it was wrong.

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AccessDenied
  • AccessDenied
do you have your work? We can possibly see what you did wrong. :) the answer is wrong, but it doesnt seem too far off
anonymous
  • anonymous
No I erased it all.
AccessDenied
  • AccessDenied
hmm... okay well, we can solve this with a few techniques. I think its set up nicely for elimination (there's a y and a -y which will cancel), so we can just add the equations together.
anonymous
  • anonymous
Can you show me how you would do it?
AccessDenied
  • AccessDenied
|dw:1333053747989:dw| its not a great notation, but i think you can see what's going on -- adding together the terms on each side to eliminate a variable
AccessDenied
  • AccessDenied
then divide by 3, so x=4 We would substitute this back into x-y=10 or 2x+y=2 4-y=10 2(4) + y = 2 -y=6 8 + y = 2 y=-6 y = -6
anonymous
  • anonymous
Oh I get it now I think.
AccessDenied
  • AccessDenied
Well, if there's anything you are unsure of, I'll try to explain better. :)
anonymous
  • anonymous
so x = 12? Do I simplify it down to 4?
AccessDenied
  • AccessDenied
i left off on the drawing not completely simplified, but this is what i did next since it was "3x = 12": |dw:1333054190702:dw|
anonymous
  • anonymous
Can you help me with another problem?
AccessDenied
  • AccessDenied
Sure
anonymous
  • anonymous
"For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation? -x + 2y = -6 3x + y = 8"
anonymous
  • anonymous
I got '-2y + 6' - I don't know how. And I think it's wrong.
AccessDenied
  • AccessDenied
So, we'd substitute whatever the x-value is when we isolate it. -x + 2y = -6 -x + 2y - 2y = -6 - 2y -x = -6 - 2y (-1)(-x) = (-1)(-6 - 2y) x = -1*-6 + -1*-2y (distributing -1 0 = 6 + 2y
anonymous
  • anonymous
Thank you so much :)
AccessDenied
  • AccessDenied
You're welcome. :D Glad to help!
AccessDenied
  • AccessDenied
im thinking that you may just be multiplying one thing on the other side by -1 to get "-2y + 6" instead of the whole expression, which is something to avoid

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