What is the point-slope equation of the line with slope 1/4 that goes through the point (-2 8)

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Find the domain and range of the following function f(x) = 51x - 21+ 4

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x