Forming a tridagonical matrix

Hello,

Lets say I have 2 vectors v=[2 3], w=[6 7 8] and a zero nxn matrix. How can I form the tridagonical matrix which will begin and end with v vector and for each middle row, vector w middle element will be placed in his diagonal? Also will I be able to solve this system if I have a B=[1,n] row vector with linsolve?

Thank you in advance