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Najlepsze rozwiązanie

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  sonar 17.3.2011 (20:33)

  x=-y
  2x-3y=10
  
  x= -y
  2*(-y) - 3y = 10
  
  x= -y
  -2y - 3y = 10
  
  x= - y
  -5y = 10
  
  x= -y
  y= 10 : (-5)
  
  x= -y
  y = -2
  
  x= -(-2)
  y = -2
  
  x= 2
  y = -2
  
  spr.
  2x - 3y = 10
  2 * 2 - 3* (-2) = 10
  4 - (-6) = 10
  4+ 6= 10
  10 = 10
  L=P
  
  
  
  
  x-2=2y
  x+2y=-6
  
  x= 2y + 2
  x+ 2y = -6
  
  x= 2y + 2
  2y + 2 + 2y = -6
  
  x= 2y + 2
  4y = -6 -2
  
  x= 2y + 2
  4y = -8
  
  x= 2y + 2
  y= -8 : 4
  
  x= 2y + 2
  y = -2
  
  x= 2*(-2) + 2
  x= -2
  
  x= -4 + 2
  y = -2
  
  x= -2
  y = -2
  
  spr.
  x+ 2y = -6
  -2 + 2*(-2)= -6
  -2 +(-4) = -6
  -2 -4 = -6
  -6 = -6
  L=P
  
  
  
  
  -2x-3y=-2
  x-y=6
  
  -2x - 3y = -2
  x= 6 + y
  
  -2(6+y) - 3y = -2
  x= 6 + y
  
  -12 - 2y - 3y = - 2
  x= 6 + y
  
  
  -5y = -2 + 12
  x= 6 + y
  
  -5y = 10
  x= 6+y
  
  y = 10 : (-5)
  x= 6 + y
  
  y= -2
  x= 6 + y
  
  y = -2
  x= 6 + (-2)
  
  y= -2
  x= 6 - 2
  
  y = -2
  x= 4
  
  
  spr.
  -2x-3y=-2
  -2 * 4 - 3 *(-2) = -2
  -8 - (-6) = -2
  -8 + 6 = -2
  -2 = -2
  L=P
  
  
  
  
  x-2y=1
  -2x+y=4
  
  x= 1 + 2y
  -2x + y = 4
  
  
  x= 1 + 2y
  -2(1 + 2y) + y = 4
  
  x= 1 + 2y
  -2 - 4y + y = 4
  
  x= 1 + 2y
  -3y = 4 + 2
  
  x= 1 + 2y
  -3y = 6
  
  x= 1 + 2y
  y = 6 : (-3)
  
  x= 1 + 2y
  y = -2
  
  x= 1 + 2* (-2)
  y = -2
  
  
  x= 1 +(-4)
  y = -2
  
  x= 1- 4
  y = -2
  
  
  x= -3
  y = -2
  
  
  spr.
  -2x+y=4
  -2*(-3) + (-2) = 4
  6 - 2= 4
  4 = 4
  L=P

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