Rozwiąż układ rówanań dowolną metodą .
{ 2x + y = - 1
{ x + 2y = 4
2x+y=-1
x+2y=4
x=4-2y
2(4-2y)+y=-1
8-4y+y=-1
-3y=-9/(:-3)
y=3
x=4-2*3
x=-2
{ x + 2y = 4 |*(-2)
{2x+y=-1
{-2x-4y=-8
__________
-3y=-9
{y=3
{ 2x +3 = - 1
{ 2x=-4
{x=-2
SPRAWDZENIE:
{ 2*(-2) + 3 = - 1
{ (-2) + 2*3 = 4
{-4+3=-1
{-2+6=4
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2x+y=-1
x+2y=4
2x+y=-1
x=4-2y
2(4-2y)+y=-1
x=4-2y
8-4y+y=-1
x=4-2y
-3y=-9/(:-3)
x=4-2y
y=3
x=4-2*3
y=3
x=-2
{ 2x + y = - 1
{ x + 2y = 4 |*(-2)
{2x+y=-1
{-2x-4y=-8
__________
-3y=-9
y=3
{y=3
{ 2x + y = - 1
{y=3
{ 2x +3 = - 1
{y=3
{ 2x=-4
{y=3
{x=-2
SPRAWDZENIE:
{ 2x + y = - 1
{ x + 2y = 4
{ 2*(-2) + 3 = - 1
{ (-2) + 2*3 = 4
{-4+3=-1
{-2+6=4