TEKS: Chapter 111. Mathematics See All Teacher Resources

111.28.b.4

(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.