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Δx. And the y-value of this newly defined x-value must therefore be f(x₁+ Δx). The distance between x₁ and x₁+Δx is Δx. So if we calculate the slope between these two points, (x₁, f(x₁)) and (x₁+ Δx, f(x₁+ Δx)), in the same way we did before, taking the “rise” over the “run”, we will get: And here