Arturo O. answered 04/25/18
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Student,
I assume there is a typo in the question, but the form of your given equation is
y = constant [Did you mean to say y=3 or y=-3 ?]
This represents a horizontal line (i.e. slope of zero). Any other line of slope zero is parallel to the given line. That is, any line whose equation is of the form
y = constant
is parallel to your given line. Both (b) and (d) satisfy this condition.