Rozwiązywanie układu równań
x=? y=? spr.
y=-2x-1
x=y+7
{y= -2x-1
{x=y+7
{2x+y= -1
{x-y=7
_________
3x=6
x=2
{x=2
{2=y+7
{-y=5
{y= -5
SPRAWDZENIE:
* y= -2x-1
-5= -2*2-1
-5= -4-1
-5= -5
* x=y+7
2= -5+7
2=2
y+2x=-1
x-y=7
3x=6/3
2=y+7
-y=-2+7
-y=5/-1
y=-5
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{y= -2x-1
{x=y+7
{2x+y= -1
{x-y=7
_________
3x=6
x=2
{x=2
{x=y+7
{x=2
{2=y+7
{x=2
{-y=5
{x=2
{y= -5
SPRAWDZENIE:
* y= -2x-1
-5= -2*2-1
-5= -4-1
-5= -5
* x=y+7
2= -5+7
2=2
y=-2x-1
x=y+7
y+2x=-1
x-y=7
3x=6/3
x=2
2=y+7
-y=-2+7
-y=5/-1
y=-5
y=-5
x=2