Friday, March 23, 2007
Algebra (Class 63)
Overview
In the last class we developed our ability to use slope triangles and proportions to find the y-intercept of a line when given the coordinates of two points on the line. In today’s class we see how equations can be written and used to find the y-intercept.
Textbook Sections
§8-3(Txt. p.360) Slope of a Line
§8-4 (Txt. p.366) The Slope-Intercept Form of a line.
Key Attitudes
Mathematics is about generalizing and applying patterns.
Key Ideas
The slope of a line is ∆y/∆x.
The y-intercept always has a 0 for the x-value.
The x-intercept always has a 0 for the y-value.
The y-intercept or x-intercept can be found using an equation once the slope is known.
All equations for lines can be written in the form y = mx + b where m represents the slope, b represents the y-intercept, x and y represent variables for the horizontal and vertical position on a coordinate graph.
Key Skills
Drawing and labeling a coordinate graph.
Plotting points on a coordinate graph.
Determining the coordinates of points on a coordinate graph.
Finding the slope of a line given two points.
Finding the x-intercept or y-intercept using equations.
Operations with integers and positive or negative rational numbers.
Handouts
No Handouts Posted
Assignment
Graph, find the slope, the coordinates of three points on the line, and the y-intercept for the lines passing through the following points:
1) (-5, 3) and (3, 2)
2) (-5, 3) and (3, 4)
Finish practice worksheets 17.6 and 17.7
Disclaimer- The assignment as stated in class is the official assignment. Every effort is made to keep this posting accurate, but you should refer to what was stated in class as the final word.