Calculus 1 : Lines

Study concepts, example questions & explanations for Calculus 1

varsity tutors app store varsity tutors android store

Example Questions

Example Question #12 : Slope

What is the slope of the curve  at the point  ? 

Possible Answers:

Correct answer:

Explanation:

To find the a general formula for the slope of the function , derive the function with respect to :

 

The slope of the function at  is then found as:

Example Question #32 : Lines

What is the slope of the line tangent to the function at ?

Possible Answers:

None of these

Correct answer:

Explanation:

The slope of a tangent line to a function at a point can be found by taking the derivative of the function and plugging in the point at which the slope is to be found. The derivative of the funtion can be found using the product rule.

The derivative of  is .

Also, the derivative of a sin function is the cos function.

Example Question #13 : Slope

Find the slope of the line tangent to the function at .

Possible Answers:

None of these

Correct answer:

Explanation:

The slope of the tangent at a certain x is the value of the derivative at that point. The derivative of  is .

The derivative of the given function is 

.

Plugging in x=3 gives

.

Example Question #14 : Slope

What is the slope of the tangent line to at

Possible Answers:

Correct answer:

Explanation:

The derivative of a function describes the slope. Therefore, you must first find the derivative of the function, which is .

Then, you plug in the specific x value given in the problem, which is -1:

.

Therefore, your final answer is -7.

Example Question #15 : Slope

At what  values is the slope of the tangent line to equal to zero?

Possible Answers:

Correct answer:

Explanation:

First, you must find the slope equation of the tangent line to the function, which is just the derivative of the function:

.

Since that is the slope equation, you need to set that equal to 0 and factor:

, or , which yields .

Example Question #16 : Slope

The coordinates of the following points are given as follows:  and  .

If a   is tangent to  at point  and  is tangent to  at point . If   , then which of the following statements is true?

Possible Answers:

Correct answer:

Explanation:

If the two lines are perpendicular, then their slopes must be opposite reciprocals. Since both lines are tangent to the curve, , their slopes will be equal to the slope of the curve at the points to which they are tangent. So  has slope  and  has slope . Following this, if the lines are perpendicular, then 

Example Question #17 : How To Find Slope By Graphing Functions

Find the slope of the following function at .

Possible Answers:

Correct answer:

Explanation:

This problem basically amounts to finding the derivative and evaluating it at the given value. We need to use a couple different techniques to find the derivative of this function but they're all fairly simple. We need the chain rule which says:

and the product rule, which is 

So, using these we can calculate our derivative.  and , so:

this equals,

and when we plug in , we get

which can be written as 

 

Example Question #18 : How To Find Slope By Graphing Functions

If , what is the slope at ?

Possible Answers:

Correct answer:

Explanation:

To find the slope, you must find the derivative of the function. Remember, when taking the derivative, multiply the exponent by the coefficient and then subtract 1 from the exponent, this is known as the power rule.

Therefore, the derivative is:

.

Then, to find the slope at 1, just plug 1 into the derivative.

.

Example Question #31 : Lines

Find the slope of the line through:

 AND 

 

Possible Answers:

Correct answer:

Explanation:

The slope (m) between two points is found with the following formula:

We can apply this formula with the points we are given:

This is one of the answer choices.

Example Question #21 : How To Find Slope By Graphing Functions

Find the slope of the equation  at the point .

Possible Answers:

Correct answer:

Explanation:

The slope of a function at a given point is found by first taking the derivative of the function.

Use the power rule to find this derivative, given by:

By evaluating the derivative when  you will find the slope of the function at the point .

Learning Tools by Varsity Tutors