Algebra II : Functions and Graphs

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #52 : Transformations Of Linear Functions

Shift the equation   left three units and up one unit.

Possible Answers:

Correct answer:

Explanation:

Rewrite this equation in slope-intercept form, .

Shifting this equation up one unit will add one to the y-intercept.

The equation becomes:  

To shift this equation left three units, we will need to replace the x-variable with the quantity .

Use distribution to simplify the equation.

The answer is:  

Example Question #53 : Transformations Of Linear Functions

The line  is shifted right 5 units.  What must be the new equation?

Possible Answers:

Correct answer:

Explanation:

If the line is shifted right 5 units, we will need to replace the x-variable of the equation with the quantity .

Simplify by distribution.

The answer is:  

Example Question #54 : Transformations Of Linear Functions

Shift the equation  up two units.  What is the new equation?

Possible Answers:

Correct answer:

Explanation:

Before we apply any transformations, we will need to put the equation in slope-intercept form, .

Subtract  from both sides.

Divide by nine on both sides.

Shifting the equation up two units will add 2, or  to the y-intercept.

The answer is:  

Example Question #55 : Transformations Of Linear Functions

Shift the line  to the left 8 units.  What is the new equation?

Possible Answers:

Correct answer:

Explanation:

To shift the line left 8 units, we will need to replace the x-value with .

Distribute the negative four through the binomial.

Combine like-terms.  

The answer is:  

Example Question #56 : Transformations Of Linear Functions

Shift the equation  left eight units.  What must be the new equation?

Possible Answers:

Correct answer:

Explanation:

To shift the equation left eight units, replace the x-variable with the quantity of .

Simplify this equation.

Combine like-terms.

The answer is:  

Example Question #57 : Transformations Of Linear Functions

If the equation  is shifted left 9 units, what is the equation after the translation?

Possible Answers:

Correct answer:

Explanation:

Rewrite the given line in standard form to slope-intercept format:

Subtract  on both sides.

Replace the x-value with the quantity of  since we are shifting the equation left 9 units.

Distribute the negative sign through both terms of the binomial.

The answer is:  

Example Question #58 : Transformations Of Linear Functions

Translate the equation  down six units.  What is the new equation?

Possible Answers:

Correct answer:

Explanation:

Use distribution to simplify the equation.

The equation in slope-intercept form is:  

Shift the equation down six units means subtract the y-intercept by six.

The answer is:  

Example Question #59 : Transformations Of Linear Functions

For the function  we will define a linear transformation  such that .  Find the slope and y-intercept of the inverse function  of 

Possible Answers:

   

 



   

 

 

   

 



   

 



Correct answer:

   

 



Explanation:

Use the given function  to find the linear transformation defined by .  

 

First understand that in order to write  we have to take our function  and evaluate it for  and then add  to the result. 

 

 

Adding 

 

Now that we have , compute the inverse . Conventionally we replace the  notation with the  notation and solve for 

 

 

 

Therefore, 

 

 

At this point it's conventional to interchange  and  to write the inverse since we want to express it as a function of 

 

 

 

Therefore the slope is  and the y-intercept is 

 

 

 

 

 

Example Question #59 : Transformations Of Linear Functions

Transform the equation into slope-intercept form.

Possible Answers:

 

Correct answer:

 

Explanation:

In order to take an action from standard form to slope-intercept form you want to make it of the form:

where  is the y-intercept (constant/number without a variable attached to it)

 is the slope and coefficient of the  term

and the equation is set equal to  making it easier to plot graphically.

Given:

 

I. Isolate  on one side of the equation. This is done by shifting either  over to the other side of equation or the  term and the constant to the other side of the equation. It is generally preferable to shift it to make so the  term is positive by itself to simply operations and sign mixups. So in this case both  and  would be subtracted from both sides of the equation leaving:

II. Now that  is isolated by itself you want to simplify the equation so there is no coefficient other than  attached to , so in this case it'd mean dividing both sides by   leaving:

III. Simplify the expression. If you are given fractions that are divisible by each other they can be simplified.

In the case   is simplified to  and   is simplified to  leaving the final answer of:

 

Example Question #1 : Quadratic Functions

Write a quadratic equation having  as the vertex (vertex form of a quadratic equation).

Possible Answers:

Correct answer:

Explanation:

The vertex form of a quadratic equation is given by

Where the vertex is located at

giving us .

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