For this case we have that by definition, the equation of a line in the slope-intersection form is given by:
Where:
m: It's the slope
b: It is the cut-off point with the y axis
By definition, if two lines are parallel then their slopes are equal. A line parallel to, will have the same slope -3. Thus, the equation will be of the form:
We substitute the given point and find "b":
Finally, the equation is:
Answer: