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Solving a Rational Equation  Problem 6
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
If you have a fraction = another fraction, we call that a proportion. We can solve proportions using what's called "cross multiplication," or setting the product of diagonal numerators and denominators equal. Technically, what we're doing in this case is multiplying both sides by the reciprocal of one of the fractions, which makes it mathematically valid. Don't forget to include positive and negative solutions if you are taking square roots to solve for x, and don't forget to make sure all of your solutions are in the domain! (That is, make sure none of your solutions would make the denominator of one of your fractions zero.)
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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Sample Problems (6)
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Solving a Rational Equation
Problem 1 6,750 viewsSolve:
3 − 1 = 2 x + 2 x − 2 x² − 4 
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Problem 2 5,207 viewsSolve:
2 = 1 − 6x 3x + 1 x 3x + 1 
Solving a Rational Equation
Problem 3 1,407 views 
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Problem 4 1,219 views 
Solving a Rational Equation
Problem 5 1,276 views 
Solving a Rational Equation
Problem 6 1,096 views
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