What is the equation for the vertical asymptote of the function y=(x−6)/(x+7) ?

A rational function has a vertical asymptote where its denominator is zero, as long as the numerator is not also zero there. Set x + 7 = 0 to get x = −7; the numerator at x = −7 is −13, so it does not cancel. The equation of the vertical asymptote is x = −7, choice D.

AI-written and checked against the verified answer.