This is a question of proportions:
First we can work out how many feet it goes up for each feet he steps back:
5.5/6 ft per each feet he steps back.
Now we can multiply this by the amount of ft back the cliff is:
(5.5/6)*30 = 27.5 ft
Thus the cliff is 27.5 ft tall,
Hope this helps :)
All you have to do is make the fraction of it which is 4/30. Then simplify to 2/15 which is your answer.
The answer is Y=-2/5x+1 :)
8540 should be the standard notation
