The math department purchases a photocopier for $4,500. Write an equation (in y=mx+b form) to model the value of the photocopier, y, in
x years if the copier's value depreciates at a constant rate of $400 per
year.

Driving 75 mph, it takes alicia 2 hours to reach the airport to go on a vacation. it then takes her 4 hours to get to her destination with the jet traveling at a speed of 400 mph. how many miles does alicia travel to get to her destination?

If a || b and e || f , what if the value of y ?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.