Final answer:
To write the equation of a perpendicular line to a given line in point-slope form, find the negative reciprocal of the slope of the given line and use the point-slope form.
Step-by-step explanation:
In order to write the equation of a perpendicular line to a given line in point-slope form, you need to find the negative reciprocal of the slope of the given line. Let's say the slope of the given line is m. The slope of the perpendicular line would be -1/m. Then, you can use the point-slope form y - y1 = m(x - x1) to write the equation, where (x1, y1) is a point on the perpendicular line.