1. Mon, 12/3 SWBAT…compute slope Agenda 1. WU (5 min) 2. Notes on slope (45 min) Warm-Up: Set up your notes. Topic is “Slope” HW#3: Slopes of lines (front & back)

2. How can we write 7% as a fraction?

3. 7% as a fraction?? Remember than any percent is a part of 100.

4. The grade or incline of a road is the same as slope Here is the picture: 7 feet 100 feet

5. Slope of a line (m) To find the slope, use the formula 4 4 (elevacion) (desplazamiento)

6. Slope of a line (m) To find the slope, use the formula 4 4

7. Why do we use m for slope? Possibly because m comes from the French word “monter”, which means to climb

8. Slope of a line (m) Is the slope positive or negative? Answer: Positive, read from left to right

9. Slope of a line (m) Is the slope positive or negative? Answer: Negative, read from left to right

12. Your turn

13. “Official” Definition of Slope Slope is the change in the vertical distance (rise) over the change in the horizontal distance (run) Pendiente: Razon del cambio en la coordenada y (elevacion) al cambio correspondiente en la coordenada x (desplazamiento) a medida que uno se mueve de un punto a otra en una recta.

14. Find the slope of the line that passes through (1, 0) and (-1, -1). Question (x 1, y 1 ) (x 2, y 2 ) (To see the slope visually… Plot these points. Connect the line.

15. 1 2 m  What the graph looks like

16. What is the slope of this line? xy 02 21 40 6

17. Horizontal lines have a slope of ___ Vertical lines have a slope of ___ HorizontalVertical m = 0 m = undefined Algebraically prove that the slope of a vertical line is undefined.

18. Directions: Find the value of r so the line that passes through each pair of points has the given slope. (12, 10), (-2, r) m = -4