to są układy równań trzeba je rozwiązać POMÓŻCIE!!!
{3y=6{x+y=9
{x-4=0{2y+x=12
3y=6
y=6-3
y=3
x+y=9
x+3=9
x=9-3
x=6
-----------------------------
x-4=0
x=4
2y+x=12
2y+4=12
2y=12-4
2y=8 /:2
y=4
1)
{y=2
{x+2=9
{x=7
2)
{x=4
{2y+4=12
{2y=8
{y=4
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3y=6
y=6-3
y=3
x+y=9
x+3=9
x=9-3
x=6
-----------------------------
x-4=0
x=4
2y+x=12
2y+4=12
2y=12-4
2y=8 /:2
y=4
1)
{y=2
{x+2=9
{y=2
{x=7
2)
{x=4
{2y+4=12
{x=4
{2y=8
{x=4
{y=4