Rozwiąż układ równań x=y+5x-1=2(y-1)
{x+y=5{x-2y=-1
x=5-y
5-y-2y=1
-3y=-4
y=4/3
x=5-4/3
x=3 i 2/3
y=1 i 1/3
y+5=2(y-1) + 1
y + 5 = 2y - 2 +1
y +5 = 2y +1
4 = y
czyli pierwsze to
x = 9
x-1 = 7
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{x+y=5
{x-2y=-1
x=5-y
5-y-2y=1
x=5-y
-3y=-4
x=5-y
y=4/3
x=5-4/3
y=4/3
x=3 i 2/3
y=1 i 1/3
y+5=2(y-1) + 1
y + 5 = 2y - 2 +1
y +5 = 2y +1
4 = y
czyli pierwsze to
x = 9
x-1 = 7