1. Lesson 3-4 Equations of Lines

2. Vocabulary
slope-intercept form
point-slope form

3. Concept

4. Example 1
Slope and y-intercept
Write an equation in slope-intercept form of the line with slope of 6 and y-intercept of –3.

5. Example 1 Answer: Plot a point at the y-intercept, –3.
Slope and y-intercept
Answer:
Plot a point at the y-intercept, –3.
Use the slope of 6 or to find another point 6 units up and 1 unit right of the y-intercept.
Draw a line through these two points.

6. Example 1
Write an equation in slope-intercept form of the line with slope of –1 and y-intercept of 4.