Common Core: 8th Grade Math : Give Examples of Linear Equations: CCSS.Math.Content.8.EE.C.7a

Study concepts, example questions & explanations for Common Core: 8th Grade Math

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Example Questions

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Example Question #171 : Equations / Inequalities

Solve the rational equation:

Possible Answers:

no solution

 or 

Correct answer:

no solution

Explanation:

With rational equations we must first note the domain, which is all real numbers except  and . That is, these are the values of  that will cause the equation to be undefined. Since the least common denominator of , and  is , we can mulitply each term by the LCD to cancel out the denominators and reduce the equation to . Combining like terms, we end up with . Dividing both sides of the equation by the constant, we obtain an answer of . However, this solution is NOT in the domain. Thus, there is NO SOLUTION because  is an extraneous answer. 

Example Question #173 : Equations / Inequalities

How many solutions does the equation below have?

Possible Answers:

One

Infinite 

No solutions

Two

Three

Correct answer:

No solutions

Explanation:

When finding how many solutions an equation has you need to look at the constants and coefficients.

The coefficients are the numbers alongside the variables.

The constants are the numbers alone with no variables.

If the coefficients are the same on both sides then the sides will not equal, therefore no solutions will occur.

Use distributive property on the right side first.

           

No solutions

Example Question #1 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Solve:  

Possible Answers:

Correct answer:

Explanation:

First factorize the numerator.

Rewrite the equation.

The  terms can be eliminated.

Subtract one on both sides.

However, let's substitute this answer back to the original equation to check whether if we will get  as an answer.

Simplify the left side.

The left side does not satisfy the equation because the fraction cannot be divided by zero.

Therefore,  is not valid.

The answer is:  

Example Question #4 : How To Find Out When An Equation Has No Solution

Solve for :

Possible Answers:

No solution

Correct answer:

No solution

Explanation:

Combine like terms on each side of the equation:

Next, subtract  from both sides. 

Then subtract  from both sides. 

This is nonsensical; therefore, there is no solution to the equation.

Example Question #2 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Solve the equation:  

Possible Answers:

No solution

Correct answer:

No solution

Explanation:

Notice that the end value is a negative.  Any negative or positive value that is inside an absolute value sign must result to a positive value.

If we split the equation to its positive and negative solutions, we have:

Solve the first equation.

The answer to  is: 

Solve the second equation.

The answer to  is:   

If we substitute these two solutions back to the original equation, the results are positive answers and can never be equal to negative one.

The answer is no solution. 

Example Question #3 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Select the option that describes the solution(s) for the following equation:

Possible Answers:

Infinitely many solutions 

No solution

One solution 

Correct answer:

No solution

Explanation:

Let's begin by discussing our answer choices:

In order for an equation to have no solution, the equation, when solved, must equal a false statement; for example,

In order for an equation to have one solution, the equation, when solved for a variable, but equal a single value; for example,

In order for an equation to have infinitely many solutions, the equation, when solved, must equal a statement that is always true; for example,  

To answer this question, we can solve the equation:

This equation equals a false statement; thus, the correct answer is no solution.  

Example Question #4 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Select the option that describes the solution(s) for the following equation:

 

Possible Answers:

No solution

One solution 

Infinitely many solutions 

Correct answer:

No solution

Explanation:

Let's begin by discussing our answer choices:

In order for an equation to have no solution, the equation, when solved, must equal a false statement; for example, 

In order for an equation to have one solution, the equation, when solved for a variable, but equal a single value; for example, 

In order for an equation to have infinitely many solutions, the equation, when solved, must equal a statement that is always true; for example,  

To answer this question, we can solve the equation:

This equation equals a false statement; thus, the correct answer is no solution.  

Example Question #5 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Select the option that describes the solution(s) for the following equation:

 

Possible Answers:

Infinitely many solutions 

One solution 

No solution

Correct answer:

No solution

Explanation:

Let's begin by discussing our answer choices:

In order for an equation to have no solution, the equation, when solved, must equal a false statement; for example, 

In order for an equation to have one solution, the equation, when solved for a variable, but equal a single value; for example, 

In order for an equation to have infinitely many solutions, the equation, when solved, must equal a statement that is always true; for example,  

To answer this question, we can solve the equation:

This equation equals a false statement; thus, the correct answer is no solution.  

 

Example Question #6 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Select the option that describes the solution(s) for the following equation:

 

Possible Answers:

No solution

One solution 

Infinitely many solutions 

Correct answer:

No solution

Explanation:

Let's begin by discussing our answer choices:

In order for an equation to have no solution, the equation, when solved, must equal a false statement; for example, 

In order for an equation to have one solution, the equation, when solved for a variable, but equal a single value; for example, 

In order for an equation to have infinitely many solutions, the equation, when solved, must equal a statement that is always true; for example,  

To answer this question, we can solve the equation:

This equation equals a false statement; thus, the correct answer is no solution.  

Example Question #7 : Give Examples Of Linear Equations: Ccss.Math.Content.8.Ee.C.7a

Select the option that describes the solution(s) for the following equation:

 

Possible Answers:

One solution 

Infinitely many solutions 

No solution

Correct answer:

Infinitely many solutions 

Explanation:

Let's begin by discussing our answer choices:

In order for an equation to have no solution, the equation, when solved, must equal a false statement; for example, 

In order for an equation to have one solution, the equation, when solved for a variable, but equal a single value; for example, 

In order for an equation to have infinitely many solutions, the equation, when solved, must equal a statement that is always true; for example,  

To answer this question, we can solve the equation:

This equation equals a statement that is always true; thus, the correct answer is infinitely many solutions.  

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