Odpowiedzi

2009-11-26T21:22:20+01:00
A)
{x/2 + y/3 = 1 1/3
{x/3 - y/2 =2 1/3

{x/2 + y/3 = 4/3 /*6
{x/3 - y/2 = 7/3 /*6

{3x + 2y = 8 /*2
{2x - 3y = 14 /*-3

{6x+4y=16
+{-6x+9y=-42

13y=26

y=2

{3x+2*2=8
{y=2

{3x=4 /:3
{y=2

{x=1 i 1/3
{y=2

b)
{3/5x + 1/2y = 2 /*10
{1/2(2x-y)=2 /*2

{6x+5y=20
{2x-y=4 /*5

{6x+5y=20
+{10x-5y=20

{16x=40

{x=2 1/2

{x=2 1/2
{5-y=4

{x=2 1/2
{-y=-1

{x=2 1/2
{y=1
2 5 2
2009-11-26T21:23:18+01:00
B) 3/5 x + 1/2y = 2
1/2 (2x - y) = 2

3/5x +1/2y = 2
2 1/2x - 1/2y = 2

3/5x + 1/2y = 2
-1/2y = 2 - 2 1/2 /:(-1/2)

3/5x + 1/2y = 2
y= -1-1

3/5x +1/2y = 2
y= -2

3/5 + 1/2 razy (-2) = 2
y= -2

3/5x - 1 = 2
y=-2

3/5x - 1 =2
y= -2

3/5x = 2-1 /*5
y= -2

3x=5 /:3
y=-2

x=3\5
y= -2

Nad punktem a jeszcze mysle :D nie wiem czy zdaze dzis :D jak cos to sory zab błedy staralem sie jak mogłem ;)
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