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jiberjiber
What is and how do you find the y-asymptote?
Are you talking about a horizontal asymptote?
|dw:1334281798918:dw| That dotted line is a vertical asymptote.
If the degree of the numerator is less than the degree of the denominator then y = 0 is a horizontal asymptote.
If the degree of the numerator is equal to the degree of the denominator than divide the coefficients of the terms of highest degree. \[y=\frac{a _{n}}{a _{m}}\] is the horizontal asymptote.
If the degree of the numerator is greater than the degree of the denominator, then there is no horizontal asymptote.