Question

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

Answer 1

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).

Answer 2

Step-by-step explanation:

$\color{blue}{angle \: made \: by \: line \: y = - x \: with} \\ \color{blue}{positive \: direction \: of \: x - axis} \\ \color{red}{ \underline{is \: 45 \degree}}$