Need a shorty to come clean me dry

Ascuba diver was 80 feet below sea level and swam up at a rate of 4 feet per minute. the two solutions show how long it took the scuba diver to reach an elevation of 20 feet below sea level. lydia and max used the methods shown below to find the time it took the diver to reach the new elevation.

Find the equation using the point (4,8)

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.