zad 9 str 100 matematyka 2 a)
{2x-2y=7
{4x+3v=21
prosze o szybką odpowiedź
2x-2y=7 /* (-2)
4x+3y=21
-4x + 4y= -14
4x +3y = 21
-4x + 4y + 4x +3y = -14+21
7y= 7/:7
y= 1
4x + 3y= 21
4x + 3 = 21
4x= 21-3
4x= 18/:4
x= 4,5
Pozdrawiam, Damiankw :)
{2x-2y=7/:2
{4x+3y=21
{x-y = 3,5
{4x +3y= 21
{x= 3,5- y
{14- 3,5y +3y = 21
{x=3,5-y
{-0,5y = 7/:(-0,5)
{y=-3,5
{x=7
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2x-2y=7 /* (-2)
4x+3y=21
-4x + 4y= -14
4x +3y = 21
-4x + 4y + 4x +3y = -14+21
7y= 7/:7
y= 1
4x + 3y= 21
4x + 3 = 21
4x= 21-3
4x= 18/:4
x= 4,5
Pozdrawiam, Damiankw :)
{2x-2y=7/:2
{4x+3y=21
{x-y = 3,5
{4x +3y= 21
{x= 3,5- y
{14- 3,5y +3y = 21
{x=3,5-y
{-0,5y = 7/:(-0,5)
{x=3,5-y
{y=-3,5
{x=7
{y=-3,5