Adding a line to my plot3 of a plane

I am having a bit of a problem adding a line to my plot3 of a plane. This is my code for plotting just the plane

X = Final(1,:,:);
Y = Final(2,:,:);
Z = Final(3,:,:);
plot3(X,Y,Z,'o','color','b');   

and it gives me this plot, which is what I want :

But then I wanted to add position vector to it - and as I understood it then its just a line from point b to projection of b onto the new plane (which is what is in the plot above).

So I just chose one of the original points as the p1 and p2 as the projection of it and then wanted to plot a line between them and add to the plot above. There I am having the trouble.

%Position vector
p1 = [200; -107; 0] %%original point
p2 = [201 ; -105; 3] %projected point

X = Final(1,:,:); 
Y = Final(2,:,:);
Z = Final(3,:,:);

hold on 
plot(p1,p2) %line plot
plot3(X,Y,Z,'o','color','b');
grid;
hold off

This is the result, but I was hoping for something like this:

Answer 1

[Asad (Mehrzad) Khoddam]

Two lines should be fixed:

1- coordinates of end points of the line

2- Using plot3

%Position vector
p1 = [200; -107; 0] %%original point
p2 = [201 ; -105; 3] %projected point
px=[100 , 101];
py=[-107, -105];
pz=[0,3];
X = Final(1,:,:); 
Y = Final(2,:,:);
Z = Final(3,:,:);
hold on 
plot3(px,py,pz) %line plot
plot3(X,Y,Z,'o','color','b');
grid;
hold off