Determine the intersection of the three planes, and the geometric nature of the intersection: 2x y+ 2 =1 3x 5y +4z= 3 3x + 2yz= 0 Mark: 9 Determine the point of intersection between the followin ' ' ' ' ' g pall' of lines, 1f an exrst. L]: r = (3,1,5) + s(4,-1,2) . y L2: 1' = (4,1,0) + t(13,-5,5) Mark: 9 Determine the perimeter of the triangle whose vertices are at the origin and x- and y- intercepts of the line R = (6,-8) + t(3,-2)