## In a coordinate plane, two nonvertical lines are parallel if and only if they have the same slope.

### In a coordinate plane, two nonvertical lines are said to be parallel if they never intersect each other

In a coordinate plane, two nonvertical lines are said to be parallel if they never intersect each other. One way to determine if two lines are parallel is by analyzing their slopes. The slope of a line determines its steepness and can be calculated using the formula:

Slope (m) = (change in y-coordinates) / (change in x-coordinates)

If two nonvertical lines have the same slope, they will always remain an equal distance apart and never intersect. This is because the slope determines how the line moves vertically and horizontally as it extends. If two lines have different slopes, they will eventually intersect at a point on the plane.

To illustrate this, let’s consider two lines with equations:

Line 1: y = 2x + 3

Line 2: y = 2x – 2

Looking at the slopes of these lines, we can see that both have a slope of 2. Therefore, Line 1 and Line 2 are parallel because they have the same slope. If we were to graph these lines, we would observe that they run parallel to each other without ever crossing.

It is important to note that when determining if two lines are parallel, it is crucial to restrict this comparison to nonvertical lines. Vertical lines have undefined slopes because their x-coordinates do not change, and comparing their slopes would not be applicable.

##### More Answers:

Understanding the Exterior Angle Theorem | Explaining the Relationship between Exterior and Remote Interior Angles of a TriangleUnderstanding the Segment Addition Postulate | Exploring Lengths and Distances in Mathematics

The Importance of Congruent Right Angles in Geometry