Proportionality - Relationships Involving Slope

Want to learn more about how to do these type of questions?

Check out Math Explorations, a series of middle school math textbooks aligned to the TEKS!

Click here to navigate back to all 8th grade math flashcards.

(4)  Proportionality. The student applies mathematical process standards to explain proportional and non-proportional relationships involving slope. The student is expected to:

(A)  use similar right triangles to develop an understanding that slope, m, given as the rate comparing the change in y-values to the change in x-values, (y₂ - y₁)/ (x₂ - x₁), is the same for any two points (x₁, y₁) and (x₂, y₂) on the same line;

(B)  graph proportional relationships, interpreting the unit rate as the slope of the line that models the relationship; and

(C)  use data from a table or graph to determine the rate of change or slope and y-intercept in mathematical and real-world problems.