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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

graph

Every point (x, f(x)) of a function drawn at once on a pair of axes.

Examples

  • The graph of f(x) = 2x + 3 is the straight path through (0, 3), (1, 5), (2, 7).

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