27 Least squares and the normal equations

0:00 Introduction 0:57 Theory: inconsistent systems 2:01 Theory: projection picture 3:05 Theory: normal equations 4:44 Example: line through three points 7:14 Theory: squares, not absolute values 7:57 Exercise: exam March 2026 9:53 Recap Narration: synthetic voice by Kyutai Pocket TTS (CC-BY-4.0), cloned from a public-domain LibriVox recording.