parallel
The slopes of the opposite sides are equal.
The slopes of parallel lines are by definition equal.
negative reciprocal slopes ---> the lines are perpendicular equal slopes ---> the lines are parallel
equal
In that case, the product of the slopes is equal to minus 1.
Yes, as long as the negative slopes are both equal.
Each pair of opposite sides has equal slopes.
equal
Their slopes are equal.
Yes
The hill slopes steeply away from the road in this area. Let's hit the slopes! (Let's go skiing!)
Lines with equal slopes are parallel, because they are going the same direction. If the slope and the intercept are the same, the lines are coinciding, because they are on top of each other.