Answer
$x=45^{\circ}$
$y= 45^{\circ}$
Work Step by Step
$m\angle 3$ = $90^{\circ}+m\angle1$
Putting given values
$3x= 90^{\circ} + x$
$x=45^{\circ}$.............................Eq1
Now in $\triangle ABC$
$ m\angle 1+ m\angle 2 = 90^{\circ}$
putting values
$x+y= 90^{\circ}$................Eq2
putting value of
$x$ from Eq1 in Eq2
$y$= $45^{\circ}$
