Question

Błaham niech ktoś rozwiążę mi to równanie metodą podstawiania !

x+y=3

x-2y=6

Z góry dzięki !

Answer 1

x+y=3

x-2y=6

 

x=3-y

3-y-2y=6

 

x=3-y

-3y=6-3

 

x=3-y

-3y=3/:(-3)

 

x=3-y

y=-1

 

x=3-(-1)

y=-1

 

x=3+1

y=-1

 

x=4

y=-1

Answer 2

x+y =3

x-2y =6

 

x =3-y

x-2y =6

3-y-2y=6

 

x=3-y

-3y=3  / /-3

 

x=3-y

y=-1

 

x=3-(-1)

y=-1

 

x=4

y=-1