Write an equation in standard form of the line passing through \( (-7,3) \) with an undefined slope. The standard form of the equation of the line passing through \( (-7,3) \) with an undefined slope is given by \( \square \). (Simplify your answer.)

A line with an undefined slope is vertical, which means it has the same x-coordinate for all points on the line. Since the line passes through the point \((-7, 3)\), the equation is simply \(x = -7\). To express this in standard form, we can rewrite it as \(1x + 0y = -7\). The standard form of the equation of the line passing through \((-7,3)\) with an undefined slope is given by \(1x + 0y = -7\).