In the coordinate system are two graphs of linear formulas #f# and #g#.
How do these two formulas relate to each other?
The two linear formulas are parallel. Two linear formulas are parallel if and only if their slopes are equal. Two linear formulas intersect if and only if their slopes are unequal. The two linear formulas are exactly in the same direction, hence, their slopes are equal. They will never intersect and are parallel.