Odpowiedzi

Najlepsza Odpowiedź!
2010-01-05T16:43:40+01:00
Mam nadzieje ze dobrze;]

1.
{5x-7y=3 /*2
{2x-3y=7 /*(-5)
{10x-14y= 6
+{-10x+15y=-35
y=-29
2x-3(-29)=7
x=-40
{x=-40
{y=-29

2.
{4x-5y=5 /*6
{6x-7y=9 /*(-4)
{24x-30y=30
+{-24x+28y=-36
-2y=-6
y=3
6x-7y=9
6x-7*3=9
x=6

{x=6
{y=3

3.
{7x+7y=21
{2x+5y+8=14
{-14x-14y=-42
+{14x+35y+56=98
21y=56=56
y=0
2x+5*0+8=14
x=3

{x=3
{y=0

4.
{6x-9y=6 /*8
{8x+5y=7/3 /*(-6)
{48x-72y=48
{-48x-30y=-14
-102y=34
y=34/102
6x-9(34/102)=6
6x=6+306/102
6x=6+3
x=2/3

{x=2/3
{y=34/102

5.
{5x-y=7
{2(x+1)=2y
{y=-7+5x
{2x+2=2(-7+5x)
{y=-7+5x
{2x+2=-14+10x
{y=-7+5x
{-8x=-16

{x=2
{y=3








1 1 1