Answer:
078°
Step-by-step explanation:
the bearing of Y from X is the angle from the north line N through X , measured in a clockwise direction to Y, that is ∠ NXY
∠ NXY and 102° are adjacent angles on a straight line and sum to 180°
∠ NXY + 102° = 180° ( subtract 102° from both sides )
∠ NXY = 78°
the 3- figure bearing of Y from X is therefore 078°