Assess students' ability to analyze proportional versus non-proportional relationships using ratios, tables, graphs, and linear equations. Tasks include identifying proportionality by checking for a constant unit rate or a straight line through the origin, computing unit rates/slopes, writing and interpreting linear equations in forms y = mx and y = mx + b, completing and reading tables and graphs, detecting non-proportional features (such as nonzero y-intercepts), and using representations to make predictions and solve missing-value problems. Appropriate for grades 6–8, medium difficulty; emphasis on translating between representations and justifying conclusions.