Standard Alignments:

TEKS Math: 8.5.H

(H) Identify examples of proportional and non-proportional functions that arise from mathematical and real-world problems

CCSS Math: 8.F.3

8.F.3 Interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; give examples of functions that are not linear. For example, the function A = s2 giving the area of a square as a function of its side length is not linear because its graph contains the points (1,1), (2,4) and (3,9), which are not on a straight line.