2x+6y=12 what's m and b?

If you're asking about slope and how to find the equation of the line, you would do it like this:

1) Arrange the equation into slope intercept form (y=mx+b)

2) 6y+2x=12 subtract the 2x from both sides and you get 6y = - 2x + 12

is in slope intercept form

3) So, m = - 2 and b=12

2x+6y=12

6y=-2x+12

y=-2/6x+2

y=-1/3x+2