exam Maths Puzzle Numerical Ability

Jennifer is 6 years older than Sue. In 4 years, she will be twice as old as Sue was 5 years ago. Find their ages now.

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Please help.
Find the slope and the y-intercept.
y = -8x - 4 Driving down a mountain ,Tom finds that he has descended 1800 ft in elevation by the time he is 3.25 miles horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth.