Rose climbs down the mountain while Lucy climbs up. The equation and the table represent the

Question

elevations of the climbers in feet, y, as functions of time in minutes, z.
Find Rose and Lucy's climbing speeds.
Rose's speed
feet per minute
Lucy's speed
? feet per minute
Rose's climb:
y=-11a +900
Lucy's climb:
Minutes, z
1
2

Answer 1

3
4
5
Elevation, y
900
890
880
870
860

Rose's speed: -11 feet per minute
Lucy's speed: 10 feet per minute