Eighteen equations — covering linear forms such as y = x + 4 alongside nonlinear ones like y = 0.5^x, y = 3x squared + 1 and y = |x| — are matched to graphs across three sections, with students identifying whether each equation-graph pairing represents a linear function. A fourth section asks four short-answer questions, prompting students to describe what linear functions look like on a coordinate plane, give examples of linear and nonlinear equations, and explain when a straight line is not a function. The worksheet is labeled with the Common Core code CCSS.Math.Content.8.F.A.3 and includes a full answer section identifying each match and classification, with additional explanations for selected items, such as noting that y = |x| is piecewise linear but not a true linear function. It is designed as independent practice or homework following a lesson introducing linear versus nonlinear functions.