anonymous
  • anonymous
Please help: 2x-7y=52 6x+44=y solve by substitution method
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
so u already have y so some of the work is done. Just plug it into the first equation.
anonymous
  • anonymous
2x-7(6x+44)=52
anonymous
  • anonymous
solve for x.

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anonymous
  • anonymous
I have a lot of trouble with linear equations. I don't understand how to do them. I need step by step instructions, but in college, I guess they figure you should already understand the basics, but I don't. :(
anonymous
  • anonymous
2x-42x-308=52
anonymous
  • anonymous
combine like terms.
anonymous
  • anonymous
-40x-308=52
anonymous
  • anonymous
-40=308+52
anonymous
  • anonymous
-40x=360
anonymous
  • anonymous
divide by -4
anonymous
  • anonymous
x=360/-4
anonymous
  • anonymous
x=-90
anonymous
  • anonymous
we solved for x, now lets solve for y.
anonymous
  • anonymous
y=6x+44
anonymous
  • anonymous
plug in x: y=6(-90)+44
anonymous
  • anonymous
y=-540+44
anonymous
  • anonymous
good job mate
anonymous
  • anonymous
y=-496
anonymous
  • anonymous
thanks.
anonymous
  • anonymous
so the answer should be (-90,-496)
anonymous
  • anonymous
Thank you so, so much. I think I'm finally begining to grasp the concept. :)
anonymous
  • anonymous
I may be back with more though if I run into a problem I just can't figure out. :)
anonymous
  • anonymous
no problem. Good luck on your math studies.
anonymous
  • anonymous
Thank you, again.

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