anonymous
  • anonymous
y + 2x = -1 3y - x = 4 A. (-1,1) B. (1,1) C. no solution
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
y + 2x = -1 3y - x = 4 Rearrange 2x+y = -1 -x+3y = 4
anonymous
  • anonymous
so C? sorry idk
anonymous
  • anonymous

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anonymous
  • anonymous
2x+y = -1 multiply yhis by 2 *this
anonymous
  • anonymous
multiply -1 by 2?
anonymous
  • anonymous
or2x by 2?
anonymous
  • anonymous
2x+y = -1 each term by 2 i.e. 2x*2 + 2*y = -1*2
anonymous
  • anonymous
4x+?=2 or -2 sorry i suck at math :/
anonymous
  • anonymous
4x+2y = -2
anonymous
  • anonymous
oh ok almost had it lol
anonymous
  • anonymous
2x+y = -1 -x+3y = 4 Take 2x+y=-1 y = -1-2x Use this value of y in -x+3y = 4 i.e. -x+3(-1-2x) = 4
anonymous
  • anonymous
-x - 3 - 6x = 4 -x-6x = 4+3 -7x = 7 x = 7/-7 x = -1
anonymous
  • anonymous
Now, y = -1-2x use x = -1 here y = -1-2(-1) y = -1+2 y = 1 Therefore,A
anonymous
  • anonymous
thnx :)

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