Question

The point (m, -m) lies on which of the following lines?

Answer 1

The point (m, -m) lies on the line x = -y or x + y = 0

• From given, we have a point (m, -m).
• So, it's clear that the x and y coordinates have the same magnitude with different signs.  
• when x coordinate is 1 then y coordinate will be -1, and the same pattern continues.
• Therefore, the line x = -y or x + y = 0 is a line on which the point (m, -m) lies.
• Consider the attached figure for reference.