Algebra 1 : Proportions

Study concepts, example questions & explanations for Algebra 1

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Example Questions

Example Question #51 : Proportions

Solve the proportion:  

Possible Answers:

Correct answer:

Explanation:

To solve the proportion, cross multiply the terms.

Divide by three on both sides.

The answer is .

Example Question #51 : Proportions

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Cross-multiply. When multiplying with a negative variable, answer is positive.

 Divide  on both sides. 

Example Question #52 : Proportions

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Cross-multiply. When multiplying with a negative number and variable, answer is negative.

 Divide  on both sides. When dividing with another negative number, answer is positive.

Example Question #1181 : Algebra 1

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Multiply  on both sides.

 Divide  on both sides.

Example Question #55 : Proportions

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Multiply  on both sides.

 Subtract  on both sides. Since  is greater than  and is negative, our answer is negative. We treat as subtraction problem.

Example Question #53 : Proportions

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Cross-multiply. Don't forget to distribute since the denominator of that fraction is an expression.

 Subtract  on both sides.

 Divide  on both sides.

Example Question #52 : Proportions

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Cross-multiply. Don't forget to distribute since the denominator of that fraction is an expression.

 Subtract  on both sides.

 Divide  on both sides.

Example Question #58 : Proportions

Solve for .

Possible Answers:

Correct answer:

Explanation:

 Cross multply. Don't forget to distribute as the denominators in both fractions are expressions.

 Add  on both sides.

 Subtract  on both sides.

 Divide  on both sides.

Example Question #54 : Proportions

Solve for :  

Possible Answers:

Correct answer:

Explanation:

To eliminate the proportion, cross multiply.

The equation becomes:

Divide by five on both sides.

Cancel the fives on the right side.

The answer is:  

Example Question #51 : Proportions

Joe biked  in the first  of a bike trip. How far will Joe bike in total if he spend  on this bike trip? Assume the relationship is directly proportional. 

Possible Answers:

Correct answer:

Explanation:

To solve this problem, we can set up a proportion to turn our missing value into a single variable. We know that in four hours, he traveled twelve miles. Since the relationship is directly proportional, we need to find how far this rate of travel will take him in eleven hours. Now that this is set up, we can cross multiply to elminate the fractions:

    

Set these equal to each other:

  Divide both sides by four

  traveled over eleven hours of biking. 

 

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