Assessment Brief

Please please please help me with these two questions there due in less than 15 hours and I have no idea what to do.
An aeroplane crashed in the Simpson Desert at co-ordinates (-15, 12).An aeroplane crashed in the Simpson Desert at co-ordinates (-15, 12). The first search party sets out by 4 wheel drive from the point (18, 3) and travels in a straight line passing through the point (3, 9). The second search party sets out by light plane from point (3, -15) and travels in a straight line passing over the point (-3, -6).
Which of these search parties pass over the crashed aeroplane if they continue on these paths? Justify your answer graphically.
Including working out
And
The human body holds a minimum of 6 litres of water. When we drinkThe human body holds a minimum of 6 litres of water. When we drink water we add to this amount stored in our body. In addition to the 6L of water already in their body each of the three survivors had drunk some water before the flight. Mark drank 1.5L of water, Sarah drank 500mL and Ali has not drunk any extra water. When the aeroplane crashed in the desert all the water on the plane was lost.
Dehydration occurs when water evaporates from our bodies and is not replaced. While in the desert the human body evaporates water at a linear rate of 3 litres per hour.
There are three stages of dehydration:
Fatigue