Which product design innovation first allowed users to dynamically manipulate mathematical functions in real-time by dragging points on a graph, transforming how students visualize equations?

Mathematical tools and software have revolutionized how we teach, learn, and apply mathematical concepts. Behind these innovations are fascinating product design decisions that shape how users interact with complex mathematical ideas. This trivia question explores a groundbreaking design choice that transformed how we visualize and understand mathematical functions.

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Geometer's Sketchpad's 'drag test' feature (1991)
Microsoft Excel's graphing calculator plugin (1987)
Texas Instruments' Interactive Graph interface (1995)
Mathematica's Dynamic Modeling system (1988)