Math 4-3: Slope
Objective: How to find the slope
of a line.
Math 4-3: Bellringer
1. Make coordinate plane
2. Plot any point in Quadrant III
3. Roll number cube and move that many units up from point
4. Roll number cube again and move that many units to right
5. Do NOT roll again, but plot 2 more points according to
previous rolls
6. Connect the 4 points
7. Describe the relationship between moves as points were
plotted and the rate of change between the points
Vocabulary
1. slope – the rate of change between any
two points on a line. The ratio of vertical
change to horizontal change.
2. rise – the vertical change between any
two points on a line. (y’s)
3. run – the horizontal change between any
two points on a line. (x’s)
Slope
y2  y1
rise
vertical change
slope 


run horizontal change x2  x1
• find the difference between y’s
• find the difference between x’s
• do not have to simplify into mixed numbers
Find Slope Using a Graph
• (1,0) and (0,2)
• (2,2) and (4,6)
Find Slope Using a Table
x
-2
1
4
7
y
5
1
-3
-7
Find Slope Using a Table
x
5
3
1
-1
y
-1
0
1
2
Assignment
• 4-3 PS (a)
• 4-3 E (ec)
• Quiz: Lessons 1-3 – 10/20