Rozwiąż układ równań:
{x+4y=0
{2x+3y=25
{x+4y=0 //*(-2)
{-2x - 8y = 0
{2x + 3y = 25
----------------------
- 5y = 25 //: (-5)
y = -5
{y= - 5
{x+ 4 * (-5) = 0
{y=-5
{x = 20
te na górze obustronnie pomnóż |*(-2) i potem
{-2x-8y=0
__________
5y=25|:5
y=5
I teraz tylko sobie podstaw y=-5. :)
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{x+4y=0 //*(-2)
{2x+3y=25
{-2x - 8y = 0
{2x + 3y = 25
----------------------
- 5y = 25 //: (-5)
y = -5
{y= - 5
{x+ 4 * (-5) = 0
{y=-5
{x = 20
te na górze obustronnie pomnóż |*(-2) i potem
{-2x-8y=0
{2x+3y=25
__________
5y=25|:5
y=5
{2x+3y=25
{y=-5
I teraz tylko sobie podstaw y=-5. :)