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y-druga liczba
układ równań
x-y=4
x+y=-2
x=4+y
4+y+y=-2
x=4+y
2y=-2+4
x=4+y
2y=2/:2
x=4+y
y=1
x=4+1
y=1
x=5
y=1
spr. war. zad.
x-y=4
5-1=4
y-2 liczba
x-y= 4
x+y=-2
x=4+y
x+y=-2
x=4+y
4+y+y=-2
x=4+y
2y=-2-4 /2
x=4+y
y=-3
x=4+(-3)
x=1
x=1
y=-3
y--->dróga liczba (mniejsza)
{x-y=4 /+y
{x+y= -2
{x=4+y
{4+y+y= -2
{x=4+y
{4+2y =-2 /-4
{x=4+y
{2y= -6 /:2
{x=4+y
{y=-3
{x=4+(-3)
{y=-3
{x=4-3
{y=-3
{x=1
{y=-3