15. For the line with equation , = (3, - 6) +s (-1, -4) , s ER, determine the equivalent slope-y-intercept form ( ) = mx + b) of the line. [3] 14. Find the parametric and symmetric equations for the line that goes through the points (7, 0, 5) and (-2, 4, 3). [3] 15. Find the vector and Cartesian equations for the plane that contains the points ( 4, - 2, 3) (2, - 4, 1) and (6, 1, 5) . [4]