Math rate of change
posted by Chelsea on .
Find the rate of change for the numbers shown below. Express number as a fraction.
(3,7)
(0,5)
(3,3)
(6,1)

(57)/(0(3)) = 2/3
(35)/(30) = 2/3 remarkable
(13)/(63) = 2/3
just for sport
(17)/(6(3)) = 6/9 = 2/3 how do you like that? It might be a straight line through those points with slope = 2/3
Try one of those points in
y = (2/3)x + b
7 = (2/3)(3) + b
7 = 2+b
b = 5
so
y = (2/3) x + 5 goes through all points I believe
Try it in the last point
1 = (2/3)(6) + 5 ?
1 = 4 + 5
1 = 1 , sure enough, done 
If you followed that, you can do them all without my help.