September 2018 0 11 Report

zad5 Rozwiąż układy równań metodą podstawiania f) {6x-3y=9 x+5y=-9,5

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sylwia345
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sylwia345

 

{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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\left \{ {{6x-3y=9} \atop {x+5y=-9,5 /(-6)}} \right

_____________________________________________

\left \{ {{6x-3y=9} \atop {6x-30y=57}} \right

_____________________________________________

  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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