Inverse Variation | MathHelp.com @yourteachermathhelp

Uploaded February 2016 | Updated September 2026, 2 weeks ago

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This lesson covers inverse variation. Students learn that inverse variation is a relationship between two variables in which one variable increases while the other variable decreases. And if the variables are x and y, the following formula can be used to represent inverse variation: xy = k, where k is the constant of variation. Students also learn that the following formula can be used to represent inverse variation between two ordered pairs: x1y1 = x2y2.

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$Lowest Common Denominator | Math Placement Test | ALEKS | TSI | ACCUPLACER | PERT | MathHelp.com Prep for your math placement test at MathHelp.com: https://www.mathhelp.com This lesson covers subtracting fractions using the lowest common denominator. Students learn to subtract unlike fractions by first finding a common denominator. For example, to subtract 7/12 - 1/3, first find the common denominator of 12 and 3, or the Least Common Multiple of 12 and 3, which is 12. Then multiply the numerator and denominator of 1/3 by 4, to get the equivalent fraction 4/12. Next, subtract the like fractions, 7/12 + 4/12, to get 3/12. Finally, reduce 3/12 to 1/4.$

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