rozwiąż układ równań
{2(x+3)-3(x+y)=8
{5x-3y=1
{2(x+3)-3(x+y)=8
{5x-3y=1
2x + 6 - 3x - 3y = 8
5x - 3y = 1
-x - 3y = 2 /. (-1)
5x - 3y = 1
x + 3y = -2
5x - 3y = 1
6x = -1
x = -6
2x + 6 - 3x - 3y = 8
2.(-6) + 6 - 3.(-6) - 3y = 8
-12 + 6 + 18 - 8 = 3y
3y = 4
y = 4/3
{2x+6-3x-3y=8
{5x-3y=1
{-x-3y=2/*(-1)
{5x-3y=1
{x+3y=-2
{5x-3y=1
-----------+
6x=-1
x=-1/6
podstawiamy do 1
-1/6+3y=-2
3y=-2+1/6
3y=-2+1/6
3y=-12/6+1/6
3y=-11/6 /*1/3
y=-11/18