I hope that this post doesn't come too late.
I'll list the steps what you should do to draw the graph of
1. Draw the graph of
using a table of x and y-values. (black line)
2. Draw the straight line (blue line)
3. Mark points on the graphs which have the same x-value. Measure the y-value of the points placed on the graph of f (black distances). Add these y-values to the y-values of the points placed on the straight line.
4. You'll get a set of points (large red points). Connect these large red points to get the graph of
The second problem has to be done in exactly the same way. I'll leave it to you.