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układ sprzeczny – nie ma rozwiązania
{x+2*(7-2x)=9 i obliczamy 2 równanie
x+14-14x=9
-13x=-5
x=5/13 i podstawiamy do I
y=7-2* 5/13
x=5/13 y=6 3/13
2, {x=2-y
{2*(2-y)+2y=8
4-4y+2y=8
-2y=4
y=-2
x=2-(-2) x=4
3, {2y=12-4x /:2
y=6-2x
x+6-2x=2
-x=-4
x=4
y=6-2*4 y=-2
5. {0,5y=4-2x
y=8-4x
-3(8-4x)+6x=8
-24-12x+6x=8
-6x=32
x=-5 i 1/3
y=8-4*5 1/3 y=-13 i 1/3
6. 2y=1,5-30x
y=3/4-15x
12(3/4 - 15x) -15x =9
9-165x=9
x=0
y=3/4 - 15*0 y=3/4