4(x-1)-5(y+2)=x-3y
mnożę obstronnie 2 równanie przez 20 i otrzymje:
{ 4(x-1) - 5(y+2) = x-3y
{ 4(x+1) -10(1-y) = 20y + 5x
{ 4x - 4 -5y-10 -x+3y=0
{4x+4 -10 + 10y -20y -5x = 0
{3x -2y = 14
{ -x -10y = 6 /*3
{3x - 2y = 14
{ -3x -30y = 18
-32y = 32 /:(-32)
y=-1
-x -10y = 6
-x +10 = 6
-x = -4 /:(-1)
x=4
{x=4
{y=-1
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mnożę obstronnie 2 równanie przez 20 i otrzymje:
{ 4(x-1) - 5(y+2) = x-3y
{ 4(x+1) -10(1-y) = 20y + 5x
{ 4x - 4 -5y-10 -x+3y=0
{4x+4 -10 + 10y -20y -5x = 0
{3x -2y = 14
{ -x -10y = 6 /*3
{3x - 2y = 14
{ -3x -30y = 18
-32y = 32 /:(-32)
y=-1
-x -10y = 6
-x +10 = 6
-x = -4 /:(-1)
x=4
{x=4
{y=-1