Question

rozwiąż układ równań:

x-y x+y

---- - ----- = 0,5

2 3

x+y=3

Answer 1

x-y          x+y

----     -   ----- = 0,5 | *6

 2             3

 

x+y=3

 

 

3*(x-y)-2*(x+y) = 3

x+y = 3

 

3x-3y-2x-2y = 3

x = 3-y

 

x-5y = 3

x = 3-y

 

3-y-5y = 3

x = 3-y

 

-y-5y = 3-3

x = 3-y

 

-6y = 0 |:-6)

x = 3-y

 

y = 0

x = 3-0

 

y = 0

x = 3