Rozwiąż układ równań.
drugie równanie mnozymy obustronnie *12
{8x+12 -8y+2 = 30
{4(5x+1) -3(y-3)=36
{8x-8y=16 /:2
{20x+4-3y+9 = 36
{ x-y=8 /*-3
{20x-3y=23
{-3x+3y=-24
17x = -1
x=-1/17
x-y=8
-y=8-x
y=-8+x
y=-8-1/17
y=-8 1/17
spr:
{ x-y=8
-1/17-(-8 1/17 )=8
-1/17+8 1/17=8
8=8
l=p
20*(-1/17)-3*(137/17)=23
-20/17+411/17=23
23=23
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drugie równanie mnozymy obustronnie *12
{8x+12 -8y+2 = 30
{4(5x+1) -3(y-3)=36
{8x-8y=16 /:2
{20x+4-3y+9 = 36
{ x-y=8 /*-3
{20x-3y=23
{-3x+3y=-24
{20x-3y=23
17x = -1
x=-1/17
x-y=8
-y=8-x
y=-8+x
y=-8-1/17
y=-8 1/17
spr:
{ x-y=8
-1/17-(-8 1/17 )=8
-1/17+8 1/17=8
8=8
l=p
20*(-1/17)-3*(137/17)=23
-20/17+411/17=23
23=23