Dwa zadania. Daję naj!
obustronnie mnożymy przez 2 /*2
/*(-1+2x)
4-6x=-1+2x
5=8x
x=5/8
z.2
x+3y=5
2x-y=3 /*3
6x-3y=9
-----------
7x=14
x=2
3y=5-x
3y=5-2
3y=3
y=1
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obustronnie mnożymy przez 2 /*2
/*(-1+2x)
4-6x=-1+2x
5=8x
x=5/8
z.2
x+3y=5
2x-y=3 /*3
x+3y=5
6x-3y=9
-----------
7x=14
x=2
x+3y=5
3y=5-x
3y=5-2
3y=3
x=2
y=1