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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.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
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Sample Problems (6)
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Solving a Rational Equation
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2 = 1 − 6x 3x + 1 x 3x + 1 
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Problem 3 1,219 views 
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Problem 5 1,100 views 
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Problem 6 939 views
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