If two lines are perpendicular then product of their slopes -1. Pick which points coordinates are dominant in. If the equation is not in this form try to rearrange the equation.
Identify the values ofx 1x_1 x1 x start subscript 1 end subscriptx 2x_2 x2 x start subscript 2.
M1 - p 312. 32 is constant m in this equation and thus the slope of the equation. The method for finding the slope from an equation will vary depending on the form of the equation in front of you. Make sure that the line is straight.