plot - MATLAB - Plotting multiple graphs

I am new to MATLAB and am having difficulty plotting multiple graphs. Here are my vectors to graph:

S = [1.2421
     2.3348
     0.1326
     2.3470
     6.7389
     3.7089
     11.8534
     -1.8708

     ...]

Y = [1.1718
     1.8824
     0.3428
     2.1057
     1.6477
     2.3624
     2.1212
    -0.7971

    ...]

w = [0.1753
     0.3277]

S is my training data and Y is my output vector. Then I add a column vector to my training data:

O = ones(length(S), 1)
X = [S 0]


w = inv(X'*X)*X'*Y

So I am trying to plot X, Y and w on the same graph. I plot w first, hold, X and this is where I get lost. Basically they are not on the same scale because the size of x is much less than X (X and Y are both vectors of size 100 and w is of size 2).

plot(w)

Then I do:

hold
plot(X)

Now the w that I plotted is so small compared to the plot of X. How would I make them the same scale? Also maybe making them a different color?