#### Answer

$\sin \theta =-\dfrac {5}{\sqrt {26}}$

#### Work Step by Step

$\sin \theta =\pm \dfrac {1}{\sqrt {1+\cot ^{2}\theta }}=\pm \dfrac {1}{\sqrt {1+\left( -\dfrac {1}{5}\right) ^{2}}}=\pm \dfrac {5}{\sqrt {26}}$
In quadrant 4 sine function is negative so
$\sin \theta =-\dfrac {5}{\sqrt {26}}$