Equations of parallel lines are just alike except for the constant term,

So any line parallel to the line that has the equation

6x + 2y = 4

has the equation

6x + 2y = k, where k is some constant other than 4.

Since the line goes through the point (-1,-2) we substitute

-1 for x and -2 for y

6(-1) + 2(-2) = k
       -6 - 4 = k
          -10 = k

So we substitute -10 that for k and get

6x + 2y = -10

If you like you can divide it through by 2

3x + y = -5

Edwin