Texas Essential Knowledge and Skills (TEKS)
TX.111.28. Grade 8, Adopted 2012.
8.4. Proportionality. The student applies mathematical process standards to explain proportional and non-proportional relationships involving slope. The student is expected to:
8.4 (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.
8.4 (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.
8.5. Proportionality. The student applies mathematical process standards to use proportional and non-proportional relationships to develop foundational concepts of functions. The student is expected to:
8.5 (B) Represent linear non-proportional situations with tables, graphs, and equations in the form of y = mx + b, where b ≠ 0.