Rozwiąż układ równan:
a+b=-4
2a+b=-1
{a+b=-4 /*(-2)
{2a+b=-1
{-2a-2b=8
_________
-b=7 /*(-1)
b=-7
a-7=-4
a=-4+7
a=3
spr.
3-7=-4
-4=-4
L=P
{a+b=-4
{a= -4 -b
2(-4 -b) +b = -1
-8 -2b +b = -1
-8 -1b = -1
-1b = -1+8
-1b = 7 /:(-1)
b = -7
a = -4 +7
a = 3
Odp.
b= -7
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{a+b=-4 /*(-2)
{2a+b=-1
{-2a-2b=8
{2a+b=-1
_________
-b=7 /*(-1)
b=-7
a-7=-4
a=-4+7
a=3
spr.
3-7=-4
-4=-4
L=P
{a+b=-4
{2a+b=-1
{a= -4 -b
{2a+b=-1
2(-4 -b) +b = -1
-8 -2b +b = -1
-8 -1b = -1
-1b = -1+8
-1b = 7 /:(-1)
b = -7
a = -4 +7
a = 3
Odp.
a = 3
b= -7