A Change in variable is a term used to express the difference between 2 variables . Let Δ{\displaystyle \Delta } represents Change in 2 variables x0{\displaystyle x_{0}} and x{\displaystyle x} then
If there is a function f(x){\displaystyle f(x)} such that when x{\displaystyle x} change by an amount Δx{\displaystyle \Delta x} the change in function will be
There are 2 points (1,3) (5,7) then