The anwser is 90 because its 90 degree angle
(X^2+8x)-(x-8)=0
x(x+8)-1(x+8)=0
(X-1)(x+8)=0
X= 1
X= -8
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The line is solid which makes the iniquity Greater than.
The shaded area is above the line so it would be greater than the slopes.
Hope this was clear :)