Odpowiedzi

2009-11-25T21:58:36+01:00
| x+2/5 -2y = 5
| x-y + 2/6 = 3

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

| 1/3 - y + 2/5 -2y = 5 /*15
|x = 1/3 - y

| 5 - y + 2 - 30y = 75
| x = 1/3 - y

| -31y = 75 - 2 - 5
| x = 1/3 - y

| -31y = 68 /:(-31)
| x= 1/3 - y

| y = - 68/31
| x = 1/3 + 68/31

| y = - 68/31
| x = 31/93 + 204/93

| y = -68/31
| x = 245/93



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2009-11-25T22:01:26+01:00
[ x+2/5-2y=5
[x-y+2/6=3 /*(-1)
{ x-2y=5-2/5
{-x+y=-3+2/6
+_____________
-2y+y=5-6/15-3+5/15
-y=1,14/15
x=5-6/15+2y
x=5-6/15+3,13/15
x=8,7/15
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