Parallel Lines and Slope

Unit 2 Lesson 4a:
Slopes of Parallel Lines

​Goal:

Students are going to solve problems of parallel lines by examining the relationship between their slopes.

Same slope, different y-intercepts.

​Parallel Equations

Concept:

Slope Intercept Form

​Slope Formula

Concepts:

​Procedures: Proving Lines Parallel

1) Find two points on each line.
2) Use slope formula to find the slope of each line.
3) If the slopes are equal then the lines are parallel.

Determine if the lines are parallel.

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​Example 1:

Determine if the lines are parallel.

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​Example 2: