Odpowiedzi

2009-11-23T20:07:50+01:00
Y-2x=-2
x-3y=7

-2x+y=-2
x-3y=7 /*2

-2x+y=-2
2x -6y = 14

-5y = 12 / : (-5)
y = - 5/12

y-2x=-2
-5/12 - 2x = -2
-2x = -2 + 5/12
-2x = -2 i 5/12 /:(-2)
x = 1 i 5/24

2009-11-23T20:15:44+01:00
Y-2x=-2
x-3y=7

-2x+y=-2 |*3
x-3y=7

-6x+3y=-6
x-3y=7

5x=1
x=1/5

y-2/5=-2
y=-8/5
y=-1,6 x= 1/5
2009-11-23T20:20:40+01:00
Y=2x-2
x-3(2x-2)=7
x-6x+6=7
-5x=1:-5
x=0.2
y-2(0.2)=-2
y-0.4=-2
y=0.4-2
{y=-1.6
{x=0.2