Odpowiedzi

Najlepsza Odpowiedź!
2010-02-24T17:55:47+01:00
1.
{2x-4(y+1)=10
{2(x+3)-(1-y)=9

{2x-4y-4=10
{2x+6-1+y=9

{2x-4y-4=10
{y=-2x+4

{2x-4*(-2x+4)-4=10
{y=-2x+4

{2x+8x-16-4=10
{y=-2x+4

{10x=30/ :10
{y=-2x+4

{x=3
{y=-2*3+4

{x=3
{y=-2

2.
{11k+17n=45
{13k+n=15

{11k+17n=45
{n=-13k+15

{11k+17(-13k+15)=45
{n=-13k+15

{11k-221k+255=45
{n=-13k+15

{-210k=-210/:(-210)
{n=-13k+15

{k=1
{n=-13+15

{k=1
{n=2


3.
{2x-y=10
{x=-17-4y

{2(-17-4y)-y=10
{x=-17-4y

{-34-8y-y=10
{x=-17-4y

{9x=44/:(-9)
{x=-17-4y

{x= -4całe i 8/9
{-4 8/9= -17-4y

{x=-4 8/9
{4y=-17+4 8/9

{x=-4 8/9
{y= -109/9 *¼= 109/36

{x=- 4 8/9
{y=-3 1/36

:)