Question

rozwiąż układ równań matodą podstawiania .

{1/3x + 2y= -1

{x + y = 2

potrzebuje na dzisiaj !!

Answer 1

{1/3x + 2y = -1

{x + y = 2

 

{1/3x + 2y = -1

{y = 2 - x

 

{1/3x + 2(2-x) = -1

{y = 2 - x

 

{1/3x + 4 - 2x = -1

{y = 2 - x

 

{ -5/3x = -5  |:(-5/3)

{y = 2 -x

 

{x = 3

{y = 2 - 3

 

{x = 3

{y = -1

Answer 2

¹/₃x+2y=-1

x+y=2

 

¹/₃x+2y=-1

x=2-y

 

x=2-y

¹/₃·(2-y)+2y=-1

 

x=2-y

²/₃-¹/₃y+2y=-1

 

x=2-y

²/₃+1²/₃y=-1

 

x=2-y

1²/₃y=-1²/₃

 

x=2-y

y=-1

 

x=2-(-1)

y=-1

 

{x=3

{y=-1