### Instruction: How many vertical asymptotes does the equation $y=\frac{x-1}{x^2+6x-7}$ have?### Response: To find the vertical asymptotes of a rational function, I need to look at the denominator and see where it is equal to zero, because that would make the function undefined.
The denominator is a quadratic expression, so I can try to factor it and see if it has any real roots.
I notice that $x^2+6x-7=(x+7)(x-1)$, so the roots are $x=-7$ and $x=1$.
That means the function is undefined at those two values of $x$, so those are the vertical asymptotes.
Therefore, the answer is 2.