Exercise 9: Line 1 has equations x =-1+2s , y= 1-2s and z = 1+4s. Line 2 has equations x = 1-t, y =t and z = 3- 2t. Line 3 has equations -y-l=. x-1 Z-4 ソー a) Show that line 1 and line 2 are parallel. b) Show that line 2 and line 3 intersect and find the angle between them.

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