Question: what is the equation of a line perpendicular to line ab?
Answer: The product of the slopes of two line segments that are perpendicular is equal to –1. In other words, if we multiply the slope of the line by the slope of AB, we will get –1. We can use the slope formula to find the slope of AB. slope of AB = (10 – (–2))/(–3 – 5) = 12/–8 = –3/2.