An escalator descends at a constant rate. After 15 seconds, the escalator is 10 feet below its original position. After 45 seconds, it

An escalator descends at a constant rate.
After 15 seconds, the escalator is 10 feet
below its original position. After 45 seconds,
it is 30 feet below its original position.
Which equation represents the change in
height in feet, y, after x seconds of riding
the escalator?

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