To write the equation of a line in point-slope form, you can use the formula:
\[ y - y_1 = m(x - x_1) \]
where \((x_1, y_1)\) is a point on the line and \(m\) is the slope.
Given the point \((-10, -1)\) and the slope \(m = -1\), we can substitute these values into the formula.
\[ y - (-1) = -1(x - (-10)) \]
This simplifies to:
\[ y + 1 = -1(x + 10) \]
Thus, the equation in point-slope form is:
\[ y + 1 = -1(x + 10) \]