For the data points (1, 2), (2, 4), (3, 5), and (4, 8), find the least-squares regression line.

What you'll learn

Instead of handing you the answer, VisTeach walks through this exact problem as a short animated lesson: it asks guiding questions first, grades your answers, and reveals each step only after you've tried — the way that actually makes the concept stick.

Free to start — your first lessons are on us.