有請各位師兄指教

Q12 : First express the two lines in the same variable (e.g. L1: y=****, L2: y=@@@@). Then equate the two **** = @@@@ and find number of roots for x

Q14: Infinitely many points of intersection = two lines are identical

Q17:
(a) is fairly easy, given slope = 1
(b) From (a)
(c) Given that you know T and V (2,-8), find distance from U to TV

Q12同Q14都ok
Q17系差個(c) part...
個P唔系x/y - axis上面...姐系得P(x,y)
如果Put P into Eqn. of TV,又求唔倒P點.
咁應該點求P?

Q17(c):

http://csm01.csu.edu.tw/0166/Math1/32/321.htm Look at Rule 1