# Question: Is A Straight Line Differentiable?

## Is a horizontal line differentiable?

The function is differentiable at a point if the tangent line is horizontal there.

In contrast, vertical tangent lines exist where the slope of a function is undefined.

The function is not differentiable at a point if the tangent line is vertical there.

It has the same slope as the curve at that point..

## How do you know if a line is differentiable?

Lesson 2.6: Differentiability: A function is differentiable at a point if it has a derivative there. … Example 1: … If f(x) is differentiable at x = a, then f(x) is also continuous at x = a. … f(x) − f(a) … (f(x) − f(a)) = lim. … (x − a) · f(x) − f(a) x − a This is okay because x − a �= 0 for limit at a. … (x − a) lim. … f(x) − f(a)More items…

## What functions are not differentiable?

A function which jumps is not differentiable at the jump nor is one which has a cusp, like |x| has at x = 0. Generally the most common forms of non-differentiable behavior involve a function going to infinity at x, or having a jump or cusp at x.

## How do you know if there is a horizontal tangent line?

Horizontal lines have a slope of zero. Therefore, when the derivative is zero, the tangent line is horizontal. To find horizontal tangent lines, use the derivative of the function to locate the zeros and plug them back into the original equation.

## How do you know if a tangent line is vertical?

Set the denominator of any fractions to zero. The values at these points correspond to vertical tangents. Plug the point back into the original formula. If the right-hand side differs (or is zero) from the left-hand side, then a vertical tangent is confirmed.

## What does it mean when the tangent line is vertical?

A tangent of a curve is a line that touches the curve at one point. … It has the same slope as the curve at that point. A vertical tangent touches the curve at a point where the gradient (slope) of the curve is infinite and undefined. On a graph, it runs parallel to the y-axis.

## What does it mean for a line to be differentiable?

what does differentiable mean? … A function is differentiable at a point when there’s a defined derivative at that point. This means that the slope of the tangent line of the points from the left is approaching the same value as the slope of the tangent of the points from the right.

## What is the tangent of a straight line?

Tangent, in geometry, straight line (or smooth curve) that touches a given curve at one point; at that point the slope of the curve is equal to that of the tangent. A tangent line may be considered the limiting position of a secant line as the two points at which it crosses the curve approach one another.

## Can a tangent line be vertical?

In mathematics, particularly calculus, a vertical tangent is a tangent line that is vertical. Because a vertical line has infinite slope, a function whose graph has a vertical tangent is not differentiable at the point of tangency.

## Do limits exist at sharp turns?

In case of a sharp point, the slopes differ from both sides. In the case of a sharp point, the limit from the positive side differs from the limit from the negative side, so there is no limit. The derivative at that point does not exist.

## Can a graph be continuous but not differentiable?

In particular, any differentiable function must be continuous at every point in its domain. The converse does not hold: a continuous function need not be differentiable. For example, a function with a bend, cusp, or vertical tangent may be continuous, but fails to be differentiable at the location of the anomaly.