8th Grade Math Unit 6

Big Idea:

Interpret and create linear and nonlinear proportional relationships on a graph.

Student Expectations:

Priority TEKS

8.4(B) [Readiness] Graph proportional relationships, interpreting the unit rate as the slope of the line that models the relationship.

8.5(D) [Readiness] Use a trend line that approximates the linear relationship between bivariate sets of data to make predictions.

8.5(I) [Readiness] Write an equation in the form y=mx+b to model a linear relationship between two quantities using verbal, numerical, tabular, and graphical representations.

Focus TEKS

8.5(A) [Supporting] Represent linear proportional situations with tables, graphs, and equations in the form of y=kx.

8.5(B) [Supporting] Represent linear non=proportional situations with tables, graphs,, and equations in the form of y=mx+b, where b is not = to 0.

8.5(C) [Supporting] Contrast bivariate sets of data that suggest a linear relationship with bivariate sets of data that do not suggest a linear relationship from a graphical representation.

8.11(A) [Supporting] Construct a scatterplot and describe the observed data to address questions of association such a linear, nonlinear, and no association between bivariate data.

Ongoing TEKS

8.11(C) [Supporting] Simulate generating random samples of the same size from a population with known characteristics to develop the notion of a random sample being representative of the population from which it was selected.

Student Learning Targets:

• I will create a scatter plot from a set of data.
• I will determine the linear relationship between the bivariate sets of data.
• I will make create trend lines and make predictions from a scatter plot.
• I will use a trend line to help predict future x or y values.
• I will write about the relationship on a scatter plot and explain how this would be useful.

Essential Questions:

• What can you determine from a trend line and when will this be useful?

Extra Information:

Adopted Textbook: McGraw-Hill 8th Grade Mathematics

District Grading Policy

Texas Gateway Online Resource Center