Section 12.3: Dot Product

Use a scalar projection to show that the distance from a point \(P_1(x_1, y_1)\) to the line \(ax + by + c = 0\) is \[ \frac{|ax_1 + by_1 + c|}{\sqrt{a^2 + b^2}} \] Use this formula to find the distance from the point \((-2, 3)\) to the line \(3x - 4y + 5 = 0\).