Explanation:
The bearing of x from y = 270^o + \(\theta\)
where \(\theta\) + 50^o = y
in \(\bigtriangleup\) OXY
O + X + Y = 180^o
Where O = 40^o + 30^o = 70^o
70^o + 30^o + y = 180^o
y + 100^o = 180^o
y = 180^o - 100^o = 30^o
\(\theta\) + 50^o = 80^o
80^o - 50^o = 30^o
The bearing of x from y = 270^o + 30^o = 300^o