Find the slope of the line going through the pair of points. (1,-5);(1,-4) 1 0 -1 Undefined

To find the slope of a line passing through two points, we use the formula for the slope \( m \):<br /><br />\[<br />m = \frac{y_2 - y_1}{x_2 - x_1}<br />\]<br /><br />Given the points \((1, -5)\) and \((1, -4)\), we can assign:<br /><br />- \(x_1 = 1\), \(y_1 = -5\)<br />- \(x_2 = 1\), \(y_2 = -4\)<br /><br />Substituting these values into the slope formula gives:<br /><br />\[<br />m = \frac{-4 - (-5)}{1 - 1} = \frac{-4 + 5}{0} = \frac{1}{0}<br />\]<br /><br />Since division by zero is undefined, the slope of the line is undefined. Therefore, the correct answer is "Undefined".