Do you have an iea of what do to before i give you the answer?
Treat "13 4/5 feet below sea level" as a negative quantity. Then add the increase, "1542 feet," obtaining
(1542 - 13 4/5) feet = 1528 1/5 feet above sea level.
2 1/6 is about 2 and 4 1/2 is about 5 so we multiply the two to get 10
The actual answer would be 13/6 * 9/2 = 117/12 = 9 and 9/12 or 9 and 3/4, so we know the estimate was good
Y=mx+b
5x+6y= -18
6y= -5x-18
y= -5/6x-3
hope this helps