How to Determine if Lines are Parallel (Using Slope)

What are parallel lines? If lines don't intersect, if they are not perpendicular lines, then they must be parallel lines. In this video we define parallel lines, giving a parallel lines definition, on the way to determining if two lines are parallel. The given a line, the slope of a parallel line to that line would be equal. That is, parallel lines have the same slop. If you need to know how to find a slope, I go over that here as well, using our slope formula.

To determine if two lines are parallel you must determine if they have equal slopes. To do this, you can either pick the information straight out if you have an equation of the line in slope intercept form or point slope form. Or, if you have two points on either line you can figure out its slope using the slope formula. If they have the same slope then they are parallel.

I hope you find this video helpful, and be sure to ask any questions down in the comments!

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