Step 1 :The slope of a line passing through two points \((x_1, y_1)\) and \((x_2, y_2)\) is given by the formula \(\frac{y_2 - y_1}{x_2 - x_1}\). However, if \(x_1 = x_2\), the denominator of this fraction becomes zero, which means the slope is undefined. In this case, the line is vertical and cannot be written in slope-intercept form (which requires a defined slope). The equation of a vertical line is simply \(x = x_1\).
Step 2 :In this case, the two points given are \((5,3)\) and \((5,-8)\). Since the x-coordinates are the same, this is a vertical line and its equation is \(x = 5\).
Step 3 :\(\boxed{x = 5}\) is the final answer.