Question

(1990,52),(1992,55),(1994,59),
(1996,63),(1998,66)
With out calculating find a 2-year period that had a greater rate of chsnge than 1990-1992 explain your reasoning

Answer 1

Well, rate of change = slope

deltaY/deltX = slope

deltaY = (y2-y1)
deltaX =(x2-x1)

For the year 1990-1992:
deltaY = (55-52) = 3
deltaX =(1992-1990) = 2

3/2 = 1.5=slope


So basically, you have to pick 2 years where
deltaY > 3
deltaY <= 2

so the only years that meet those conditions are
1994-1996