2. Find an equation for the plane containing the points P1, P2, and P3. (a) P1 = (1, -1, 1), P2 = (1, 2, 2), P3 = (-1, -1, 1) (b) P1 = (2, -1, 3), P2 = (1, 1, 1), P3 = (1, 2, 3) 3. Let y : R - R3 be a parametric equation for a curve. Find a parametric equation for the the tangent line to the curve at the point y(to). (a) y(t) = (2t, t2, -3+3); to = 1 (b) y(t) = (cos(t), sin(2t), et); to =