zad5 Rozwiąż układy równań metodą podstawiania f) {6x-3y=9 x+5y=-9,5
{6x-3y = 9
{x+5y = -9,5
{6x-3y=9
{x= -9,5 -5y
{6(-9,5-5y) -3y = 9
{x = -9,5 -5y
{-57-30y -3y = 9
{x = -9,5 -5y
{-57-33y = 9
{x = -9,5 -5y
{-33y = 9 + 57
{x = -9,5 -5y
-33y = 66 / : (-33)
y = -2
x = -9,5 -5y
x = -9,5 - 5*(-2)
x = -9,5 - (-10)
x = 0,5
spr
6x-3y = 9
6*0,5 - 3*(-2) = 9
3 - (-6) = 9
3 + 6 = 9
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0x-33y=66
-33y=66 / : (-33)
y= -2
spr.
6x-3y=9
6x+6=9
6x=9-6
6x=3/ :6
x= 1/2
y= -2
x= 1/2
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