SOLVING LINEAR EQUATIONS

Recall the following:

• A linear equation is a polynomial of degree 1.

• In order to solve for the unknown variable, you must isolate the variable.

• In the order of operations, multiplication and division are completed before addition and subtraction.

LINEAR EQUATION - Solve for x in the following equation.

Problem 1.5b:

Get rid of the denominators by multiplying both sides by 39, the smallest number that 3, and 13 will divide into evenly.

Recall the line that separates the numerator and the denominator also functions as a parenthesis. It instructs the reader to treat the numerator as one number and the denominator as one number.

Simplify:

Subtract 18x from both sides of the equation and add 338 to both sides of the equation:

Divide both sides by 112:

The answer is x=5.

Check the solution by substituting 5 in the original equation for x. If the left side of the equation equals the right side of the equation after the substitution, you have found the correct answer.

• Left side:
• Right Side:

Since the left side of the original equation equals the right side of the original equation after you substitute x=5, the answer is x=5. If you would like to go back to the problem page, click on problem.

If you would like to review the solution to problem 1.5c, click on solution.

If you would like to go back to the equation Table of contents, click on Contents.

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