Question

the angle between the graph of the equation -x and positive xaxis is
a) 45°
b) 90°
c) 135°
d) 180°
answer is c) 135° but how?? explain me ...​

Answer 1

Here we know that y = -x makes an angle 45 degree with the positive direction of y- axis.

So over all angle between y = -x and positive x-axis is 45+90= 135 .