Rozwiąż układ równań :
x=y+8
x-3y=4
y+8-3y=4
y-3y=4-8
-2y=-4/:(-2)
y=2
x=2+8
x=10
x-y=8/ *-3
-3x+3y=-24
-2x=-20/:-2
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podstawiamy x=10 do pierwszego równania
10-y=8
10-8=y
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x=y+8
x-3y=4
x=y+8
y+8-3y=4
x=y+8
y-3y=4-8
x=y+8
-2y=-4/:(-2)
x=y+8
y=2
x=2+8
y=2
x=10
y=2
x=y+8
x-3y=4
x-y=8/ *-3
x-3y=4
-3x+3y=-24
x-3y=4
-2x=-20/:-2
x=10
======
podstawiamy x=10 do pierwszego równania
10-y=8
10-8=y
y=2
======