Mathematics II - Old Questions

20. Find the equation y = a₀ + a₁x for the least squares line that best fits the data points (2, 1), (5, 2), (7, 3),(8, 3).

OR

When two vectors 4 and v are orthogonal? If u and vectors, prove that [dist (u, -v)]² = [dist (u, v)]² if u.v = 0.