Odpowiedzi

2010-02-22T13:51:01+01:00
A) {x-3y=4
{x-y=8
{x=4+3y
4+3y=8
3y=8-4
3y=4/3
y=4/3
x=4+3y
x=4+3*4/3
x=4+4
x=8
b) {y=4-2x
{x-y= -1
x-4-2x=-1
-x=-1+4
-x=3/(-1)
x=-3
y=4-2x
y=4-2*(-3)
y=4+6
y=10
c) {2x-y-1=0
{x=1/2(y+1)
2*(1/2(y+1))-y-1=0
2*(1/2y+1/2)-y-1=0
y+1-y-1=0
0=0 - równanie sprzeczne
d) {x+2/3 + y/6=1
{x-2/4-y/4=0.5/*4
{x=1-2/3-y/6
{x-2-y=2
1-2/3-y/6-2-y=2/*6
6-4-y-2-y=12
-2y=12/(-2)
y=-6
x-2-y=2
x-2+6=2
x=-2