Solving Rational Equations
These lessons help Algebra and Grade 9 students learn how to solve rational equations.
Related Pages
Solving Equations
Simplifying Rational Expressions
Algebraic Expressions
More Algebra Lessons
Grade 9 Math Lessons
The following figure shows how to solve rational equations. Scroll down the page for more examples and solutions.
Solve Rational Equations, Basics
Step 1: Multiply by LCD
Step 2: Solve resulting equation
Step 3: Check solution. Reject any solution that makes the
denominator = 0
Examples:
Solve and check the answer:
19y/6 - 5y/2 = 4
b/5 - (b - 1)/10 = 9/10
Rational Equations - Algebra Help
Students learn that when solving rational equations, the first step is to factor each of the denominators, if possible, then multiply both sides of the equation by the common denominator for all the fractions in order to get rid of the fractions, and solve from here.
Finally, check each solution to see if it makes a denominator in the original equation equal to zero. If so, then it cannot be a solution to the equation.
Example:
5/(y + 2) = 13(y2 - 3y - 10) + (-3)/(y - 5)
Solving Rational Equations
Examples:
Solve the following equations, check for extraneous solutions.
- 4/x + 5/2 = -11/x
- 5x/(x - 2) = 7 + 10/(x - 2)
- (3x - 2)/(x - 2) = 6/(x2 - 4) + 1
- 2/(x2 - x) = 1/(x - 1)
- 3/(x + 2) = 6/(x - 1)
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