In physics lab Ellie attaches a wireless sensor to one of the spokes of a bicycle wheel spinning freely on its axle The graph below shows the sensor s height above the ground in centimeters over time t measured in seconds Sensor s height in cm 50 40 30 20 10 y 0 1 2 75 48 7 25 38 2 3 4 5 6 11 75 48 16 25 38 7 8 9 10 11 12 13 14 15 16 Time in seconds Write an equation in terms of y height in centimeters above the ground and t time in seconds to represent the given context 17 18 t