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2009-10-17T12:03:28+02:00
-8x + 2y = 13
3x - y = 6 / * 2

-8x + 2y = 13
6x - 2y = 12
___________

-2x =1 / :(-2)
3x - y = 6

x = -0,5
3*(-0,5) - y = 6

x = -0,5
-1,5 -y = 6

x = -0,5
-y = 6+1,5 / : (-1)

x = -0,5
y = -7,5
1 5 1
2009-10-17T12:16:11+02:00
-8x+2y=13
3x-y=6/*2
-8x+2y=13
6x-2y=12
-2x=25
x=-12.5
y=31.5
2009-10-17T13:04:54+02:00
-8x + 2y = 13
3x - y = 6/*2

-8x + 2y = 13
6x -2y=12

-2x=25/:(-2)
x= -12,5

2y= 13+ 8*(-12.5)
2y= 13-100
2y=-87/:2
y=-43,5