1. Lesson 5-1

2. The ___________ of a line is a number determined by any two points on the line. It is the ratio of the ___________ (vertical change) over the __________ (horizontal change). slope change in y change in x x 1, y 1 x 2, y 2

3. B. Find the slope of the line that passes through (–3, –4) and (–2, –8). x 1, y 1 x 2, y 2 C. Find the slope of the line that passes through (–3, –4) and (4, –4 ) x 1, y 1 x 2, y 2 IMPORTANT NOTE : A LINE WITH A SLOPE OF ZERO WILL ALWAYS BE A HORIZONTAL LINE.

4. D.Find the slope of a line that passes through (–2, 4) and (–2, 3) IMPORTANT NOTE #2: IF THE SLOPE HAS A ZERO IN THE DENOMINATOR IT IS AN UNDEFINED SLOPE. THE LINE WILL BE A VERTICAL LINE WHEN GRAPHED.

5. PRACTICE: Find the slope of the line that passes through the given points.

6. FINDING THE SLOPE BY GRAPHING: Since slope can be defined as rise/run, count the number of units you have to go UP to get from one point to the next and then the number of units you have to move left or right. Up 3 Right 4

7. Rise = up 2 Run = left 2 Rise = up 4 Run = right2

8. PRACTICE: