anonymous
  • anonymous
which set of points is in the solution for the system of inequalities: x-y>1 and y <2x-1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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e.mccormick
  • e.mccormick
Do you know how to graph an inequality?
anonymous
  • anonymous
no
anonymous
  • anonymous
helping my son with math homework and never seen so many letters in my life

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e.mccormick
  • e.mccormick
You need to graph the line, like it was an =, then find out which side needs to be shaded. http://www.purplemath.com/modules/ineqgrph.htm
anonymous
  • anonymous
the options they give are (-1,-1) or (-2,-1) or (0,1) or (0,-2)
e.mccormick
  • e.mccormick
Well, if they give points, then what you can do is test them. Put in the x and y and see if it is true for both equations.
anonymous
  • anonymous
ok I thought so thanks
e.mccormick
  • e.mccormick
x-y>1 y <2x-1 Yah, so (-1,-1) \(x-y>1\implies -1-(-1)>1 \implies\) \(-1+1>1\implies 0 > 1\) Fails the first one, so don't bother with the second, and so on.
e.mccormick
  • e.mccormick
One of my favorite sites to look things up by topic: http://www.purplemath.com/modules/index.htm A site with amazing examples... but use Googles site search to find things on it: http://regentsprep.org/ (So in Google use site:regentsprep.org some search keys ) And the king of short, topical instuction. https://www.khanacademy.org/ Between those you should be able to learn ahead of your son for most things, and then just ask the remainder here.
e.mccormick
  • e.mccormick
Look at graping a linear inequality on Regentprep to see why I like it: http://regentsprep.org/Regents/math/ALGEBRA/AE85/GrIneqa.htm That is very easy to read, no junk on it, etc.
anonymous
  • anonymous
thanks
e.mccormick
  • e.mccormick
np. have fun!
goformit100
  • goformit100
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