[" 19.The two lines "x=ay+b,z=cy+d" and ...

[" 19.The two lines "x=ay+b,z=cy+d" and "x=a'y+b'],[z=c'y+d'" are perpendicular to each other if "],[[" E2004")," (a) "aa'+cc'=-1," (b) "aa'+cc'=1],[" (c) "(a)/(a')=(c)/(c')=-1," (d) "(a)/(a')+(c)/(c')=1]]

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