7. Graphing Rational Functions
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Just like with fractions, we cannot divide by 0 in rational functions.
- 1
y=4/x+1 To identify the excluded value, we must remember that the denominator cannot be 0 because division by 0 is not defined. Let's find the value of x that would make the denominator equal to 0. x + 1 = 0 ⇔ x = - 1 If x=- 1, the value of the denominator is 0. Therefore, the excluded value is - 1.