rozwiąż układ równań str 112 zad 11 książka Matematyka 2 taka niebieska przykład D
(x-3)\5 - (y+1) \ 2 = 1-(x-y)
(4x-1) \3 - (y-3) \6= -2(x-y)
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(x-3)\5 - (y+1) \ 2 = 1-(x-y) \*10
(4x-1) \3 - (y-3) \6= -2(x-y) \*6
2x-6-(5y+5)=1-x+y
8x-2-(y-3)=-12(x-y)
2x-6-5y-5=1-x+y
8x-2-y+3=-12x+12y
3x-6y=12 \ :3
20x-13y=-1
x-2y=4
x=2y+4
20(2y+4)-13y=-1
40y+80-13y=-1
27y=-81 \:27
y=3
x-6=4
x=10
y=3