Parameterize the plane that contains the three points (−3,1,−2)(−3,1,−2), (−6,−10,−4)(−6,−10,−4), and (15,5,20)(15,5,20). r⃗ (s, t)=r→(s, t)= (Use ss and tt for the parameters in your parameterization, and enter your vector as a single vector, with angle brackets: e. g., as < 1 + s + t, s - t, 3 - t >.)