Question 323138
If we solve the given quadratic for y, we get y=-x and y=-x/2.

I assume what is being asked is to find the angle between these two lines?.

There is a formula for finding the angle between two lines.

It is: {{{arctan((m2-m1)/(1+m1*m2))}}}

Where m1 and m2 are their respective slopes of -1 and -1/2.

{{{arctan((-1/2-(-1))/(1+(-1/2)(-1)))=arctan(1/3)=18.435}}}

Is that what you were getting at?.