Question: need help for graph and program

hey friends I have solved linear equation numerically and in the end i have ploted pointplot graph where every point in graph is taken maunally. Please help me how to write code that at specific values of x required points from 

Solution := backsub(S) 

should automatically be ploted where x=i*h and h=1/32 where i varies from 0 to m. 
 Secondly please let me know how to plot error graph where

error= exact solution - approximate solution

n both graph of exact solution and approximate solution is given in worksheet attached here

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