book Maths Puzzle Numerical Ability

Write the equation of the line that passes through the piont (4,-9) with the slope 1/5 in piont-slope form

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book Other Question

Suppose you are at a river resort and rent a motor boat for five hours starting at 7am. You are told the boat will travel 8 miles per hour upstream and 12 miles per hour returning. An aquarium is 32 inches long, 15 inches wide and 24 inches high. the volume of water in the aquarium is 10,560 cubic inches. How deep is the water?

I know the formula for volume V=lwh but how do I set up and solve this problem?