Odpowiedzi

2010-01-15T18:12:29+01:00
1.
{3x+2y = 4
{3x= 2- 2y

{3x+2y=4 / *(-1)
{3x+2y=2

{-3x-2y=-4
{3x+2y=2
0=-2
2.
{0,5x+2y= 1
{y= 2-x

{0,5x+2y= 1
{x+y=2 /*(-2)

{0,5x+2y= 1
{-2x-2y=-4
-1,5x=-3 /: (-1,5)
x=2

{x=2
{x+y=2

{x=2
{y=2-2

{x=2
{y=0