Question

A model airplane reaches a maximum altitude and then begin to descend at a constant rate in feet per second. After falling for 12 seconds, the model airplane has an altitude of 212 feet. After falling for 25 second, the model airplane’s altitude is 95 feet. Write an equation that represents the altitude of the model airplane, y, after x seconds of falling.

Answer 1

treat it as two ordered pairs of the form (t, h)
they would be (12, 212) and (25,95)
find the slope and find the equation using the method you
must have learned to do this type of problem.

Answer 2

find the rate of fall ... (change in altitude) / (change in time)
... this is the slope of the line ... y = m x + b

plug in one of the time/altitude points to find the y-intercept (b)