Find the lengths of the straight lines joining each of the following sets of points. 

a) (−8, 4) and (−2,−4) 

b) (−1, 1) and (−5, −2)

c) (6, -1) and (9,−4) 

d) (−7, −3) and (−6, −8) 

e) (4q, −4q) and (7q, −8q)

f) (2p, −6p) and (−3p, 6p)