so 30:10 and 100:40
if we simplify them, and compare we get
3:1 and 5:2 which are not equal so therefor it is not a simple whole number rate of change so
slope is the sasme thing so
slope=(y1-y2)/(x1-x2)
lets says 10=x1
30=y1
40=x2
100=y2
subsitute
(30-100)/(10-40)=-70/-30=7/3
the rate of change is 7 feet per 3 seconds or 2 and 1/3 feet per second
