1.

Show that the line joining (2,-3) and (-5,1) is parallel to the linejoining (7,-1) and (0,3).

Answer» Let A(2,-3), B(-5,1), C(7,-1) and D(0,3) be the given points.
Then, slope of AB=`(1-(-3))/(-5-2)=(4)/(-7)=-(4)/(7)`
And, slope of CD=`(3-(-1))/(0-7)=(4)/(-7)=-(4)/(7)`
`therefore` slope of AB=slope of CD.
Hence, `AB ||CD`


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