Question

6x+y=12 e 5x+2y=11 metodo da substituiçao

Answer 1

6x = 12- y
x = 12-y/6
substituindo :
5.(12-y/6) + 2y = 11
60 - 5y /6 + 12y = 11
66-60 = 7y
y = 6/7

Answer 2

6 x + y = 12
6 x = 12 - y  
x = 12 - y)/6
5 x + 2 y =11
5( 12 - y )/6 = 11
60 - 5 y )6=11
60 - 5 y=11 . 6
60 - 5 y = 66
-5 y = 66 - 60 
-5 y = 6 
y = 6/ - 5 
5 x + 2 y = 11
5 x +2(-6/5) = 11
5 x -12/5=11
5 x =11+12/5
5 x =43/5
x = 43/5 /5
x =43/5 .1/5
x = 43/10