Pre-Algebra : Two-Step Equations

Study concepts, example questions & explanations for Pre-Algebra

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Example Questions

Example Question #1 : Two Step Equations With Fractions

Solve for .

Possible Answers:

Correct answer:

Explanation:

First, you want to leave all terms with x on one side and all other terms on the other side. To do this, we can subtract 4/3 from both sides. 

We now have 

We can now multiply both sides by the reciprocal of 2/5, which is 5/2, to be able to solve for just x.

Example Question #4 : Two Step Equations With Fractions

Solve for :

Possible Answers:

Correct answer:

Explanation:

Explanation:

The goal is to isolate the variable to one side.

First, convert the mixed numbers to improper fractions:

Subtract from both sides:

Multiply each side by the reciprocal of :

Example Question #5 : Two Step Equations With Fractions

Solve for ""

Possible Answers:

Correct answer:

Explanation:

1.) Add 8 to both sides, removing the "". It now reads 

2.) Multiply both sides by 2, removing the . It now reads 

3.) Subtract  from both sides, removing the "". It now reads 

4.) Divide both sides by "", resulting in 

Example Question #11 : Two Step Equations With Fractions

Solve for x:

Possible Answers:

Correct answer:

Explanation:

To solve, use inverse opperations: do the opposite steps in the opposite order. Order of opperations is usually PEMDAS, with addition and subtraction last, so we'll do addition/subtraction first:

since it says to add , we will do the opposite and subtract from both sides:

Next we will address multiplication/division. Right now we are multiplying times the fraction . Now we want to multiply both sides times its opposite, the reciprocal :

The easiest way to do this is to think of the mixed number as the addition and multiply each part times :

So our answer is

 

Example Question #12 : Two Step Equations With Fractions

Solve for  

Possible Answers:

Correct answer:

Explanation:

 

Add  to each side

 

 

Divide both sides by , or multiply by the reciprocal which is 

 

Example Question #13 : Two Step Equations With Fractions

Solve the following equation for x.

Possible Answers:

Correct answer:

Explanation:

To solve equations with fractions, follow the same method as with integers. Collect all the terms with the variable on one side and the terms without variables on the other. 

 

In order to combine the like terms (variables vs. non-variables), the denominators of the fractions must be the same.

 

Example Question #11 : Two Step Equations With Fractions

Solve this equation: 

Possible Answers:

No solution

The answer is not here.

Correct answer:

The answer is not here.

Explanation:

Move all fractions to one side:

Simplify:

Example Question #12 : Two Step Equations With Fractions

Solve the two-step equation. Find the value of .

Possible Answers:

Correct answer:

Explanation:

        -    222      - 222

 *4        *4

Check your answer by substituting 1624 back in for x and solving the problem. This time both sides of the equation should match.

Example Question #16 : Two Step Equations With Fractions

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve for the variable, we will need to isolate the variable on one side of the equation and all other contstants on the other side. To do this, apply the opposite operation to manipulate the equation.

First, add  to both sides:

Next, multiply both sides by  to solve for :

Example Question #12 : Two Step Equations With Fractions

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve for the variable, we will need to isolate the variable on one side of the equation and all other contstants on the other side. To do this, apply the opposite operation to manipulate the equation.

First, multiply both sides by :

Next, divide both sides by  to solve for :

 

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