Can you please explain? Thank you

3. {0.2/0.83Points] I DETAILS ll PREVIOUSANSWERS I SCALCET812.5.015. (a) Find symmetric equations for the line that passes through the point (4, 1, 9) and is parallel to the vector (1, 2, 4). O(X+4)=2(y1)=4(z+ 9). X+4_Z _z+9 O 1 _ 2 _ 4' O(X4)=2(y+1)=4(z 9). X4_Z+l_Z9 1 ' 2 ' 4' =z+1=z9 Ox+4 2 _4. J (b) Find the points in which the required line in part (a) intersects the coordinate planes. Ht t- 1h l (1379 ) om o In ersec Ion W| X - ane . P y P 4 l 2: 4 X point of intersection with yzplane ( ) point of intersection with X2-plane ( ) 4. [-/0.83 Points] DETAILS SCALCET8 12.5.004. Find a vector equation and parametric equations for the line. (Use the parameter 1'.) The line through the point (0, 14, 10) and parallel to the line X = 1 + 2t, y = 6 3t, 2 = 3 + 61' r(t) = (X(t), y(t),z(t)) = ( )