Plot dubt

[Oscar Bayona Candel]

I all I want to use in a same plot a bar/hstogram graph and a line graph
 
Imagine I have three vectors:
 
X=[11 12 17 14 9 15];
 
Y=[12 11 12 14 10 9];
 
Z=[6 11 8 10 7 9];
 
I want to make a plot with the trhee variables bu the first I want to make an hist or bar chart the other two with lines in the same graph.
 
Anyone can please help me, thanks in advance for you help¡¡¡¡ 
 
 
Other question this is secundary a 2-D plot always have two y axis (left and right axis) how can I repet the Y values in both?
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