Question

$\huge\mathbb{\underline{Question:-}}$

what is the angle made by the line y = "-x" with positive direction on x-axis ​

Answer 1

Answer:

90 degree angle will be made by the line y=-x

Answer 2

Answer:

The angle that the line ax+by+c=0 makes with the positive X axis in the new coordinate system is arctan(ba). The angle that this line makes with the positive Y axis in the old coordinate system is arctan(ba).