12th grade calculus, need detailed process thanks

w 2a). Write the scalar equations of the plane 71'] , has yintercept 7; parallel to the plane dened by the equations: [x, y, z] = [7, 6, 1] + t [3, 2, -8] + s [0, -5, 3] 2b). If in is perpendicular to 7r, 3): - 2y + k 2 +1 =0. Find the value of k