A Change in variable is a term used to express the difference between 2 variables . Let Δ {\displaystyle \Delta } represents Change in 2 variables x 0 {\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 Δ x {\displaystyle \Delta x} the change in function will be
There are 2 points (1,3) (5,7) then