Answer :
Given : the lines and
.
To prove : the lines are at right angles.
Formula used : If the lines are =
=
and
=
=
then the angle between the lines ‘θ’ is given by
θ =
The lines and
.
Here p = 7 , q = -5 , r = 1 and l = 1 , m = 2 , n = 3
θ = =
θ = =
= 90°
θ = 90°
The Lines and
are at right angles.
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