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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