The solution of a function in a given value is often represented by the variable "y." Rational functions are those that include rational expressions, commonly referred to as fractions. Evaluating rational functions can be slightly more difficult than evaluating standard polynomials because cancellations and simplifications must be made throughout the process. However, rational functions are integral to a proper understanding of mathematics because they are often used to represent rates at which things change.
Instructions
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1
Substitute the desired value for "x" into the rational expression. For example, substituting 9 for "x" in the expression: y = 3x/5, yields y = (3 * 9)/6.
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2
Perform any cancellations that are possible. Using the previous example, y = (3 * 9)/6 -> y = 9/2.
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3
Simplify the expression to arrive at the final answer. In conclusion, y = 9/2.