Final answer:
The equation of line d, which is parallel to line c (y = -3x - 5), will have the same slope of -3 and a y-intercept that is not given, resulting in a general equation of y = -3x + b, where b is the y-intercept of line d.
Step-by-step explanation:
If lines c and d are parallel, line d would have the same slope as line c. Given that the equation of line c is y = -3x - 5, this means the slope of line c is -3. Therefore, line d must also have a slope of -3. The equation of line d will be of the form y = -3x + b, where b is the y-intercept of line d, which can be any number since it's not specified in the question.