Odpowiedzi

2009-12-12T17:42:50+01:00
1)5x+2y=4
4x+y=3

5x+2y=4
-8x-2y=-6

3x=-2
x=2/3

2009-12-12T17:51:42+01:00
{5x=4-2y
{4x+y=3

{5x+2y=4
{4x+y=3 /*(-2)

{5x+2y=4
{-8x-2y=-6

-3x=-2 /: (-3)
X=2/3
Y=3- (4*2/3)
Y=3 -2 i2/3
Y=1/3



{6x-3y=9
{x+5y=-9,5 /* (-6)

{6x-3y=9
{-6x-30y=57

-33y=-48 / (-33)
Y=48/33
X=-9,5- (5*48/33)
X=-9,5-240/33
X=-9,5- 7 i 3/11
X=-16,5-3/11 = -16 i 5/22