Dear Physics 129 students

there is a small typo in Homework 7 Exercise 1.

The sentence

     ... you can extract the intercepts of the two tracks with 
         the y-axis: (X1 and X2)

should really be

     ... you can extract the intercepts of the two tracks with 
         the x-axis: (X1 and X2)


this is now fixed (clear your cache).

C.