exam Maths Puzzle Numerical Ability

Find the slope of any line parallel to the line through points (15,1) and (4,2)

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can you help me with this problem?
5(x-2)=2x+10 If ship is anchored at origin of 3 dim. coordinate sys. and 2 probes are sent below the surface, 1st probe stops at (-8, -4, 6) and 2nd probe stops at
(4, -9, -2) which probe is farather from the ship?