## Wednesday, Oct. 19. 2011

October 19, 2011
###### HW due on Thursday, Periods 2 and 3

Periods 2 and 3

Today we continued our work on the group paper we started yesterday. This paper asks us to make the kinds of comparisons we have been working with in previous lessons.
We also started to discuss the next lessons. These will be on making both part-to-part and part-to-whole comparisons. Students will also be asked to compare sizes of ratios and decide which is larger. Period 3 had a very good discussion concerning these kinds of relationships.
Everyone also started on tonight's homework and were given the new Wednesday homework. Tonight's homework is based on p. 12, # 9 and 10 in our book. It is also attached to this page if someone misplaces his or her paper. The Wednesday paper will be attached in the homework calendar and in the cumulative folder.
Assignment: finish worksheet based on p. 12, #9 -10. Start work on Wednesday homework.

Period 4

We continued our work on x-intercept today. We also worked on how to find the y-intercept. In both cases, we make either the x or y equal to zero and find the other value. These two points are written as the ordered pairs (x, 0) and (0, y). They can be used to graph a line.
Students were also given the new Wednesday homework paper. This will also be an attachment on today's homework calendar and in the cumulative folder.
Assignment: 4.3B, #1-18

Period 5

We worked more on finding the slope of a line when given two points. Slope is the change in y over the change in x. We use this ratio of rise over run to determine the steepness of a line. Later we will use the slope and one point to graph the line. We talked about how to decide if the slope is positive, negative, zero, or undefined. Graphs can also help us classify the kind of slope we have—up, left to right, is a positive slope; down, left to right, is a negative slope; a horizontal line has zero slope; and the slope of a vertical line is undefined. We talked about why a vertical line has no slope by using the formula for slope. Doing this led us to see that we are dividing by zero which is not possible.
Tomorrow we will talk about how to find a missing coordinate if we are given the slope of the line and part of two ordered pairs. This is going to go directly back to what we did when we were discussing cross-product in Chapter 3. We continue to use what we know about operations with rational numbers and how to solve equations. (Algebra really does all fit together!)
Assignment: p. 239, #4 -13, 36 - 39
Work on Wednesday homework. (will be attached on homework calendar and cumulative folder.)