The measure of angle e, the angle of elevation from point a to point b, is ( 3 x plus 1 ). the measure of angle d, the angle of depression from point b to point a, is 2 ( x plus 8 ) find the measure of each angle.

Let
E> angle of elevation
D> angle of depression
we know that
E=(3x+1)
D=2(x+8)
remember that
angle of elevation is equals to angle of depression> by alternate angles
then 
E=D
(3x+1)=2(x+8)> 3x+1=2x+16> 3x-2x=16-1> x=15
E=3*15+1> 46°
D=2*15+16> 46°

the answer is
the measure of angle of elevation and angle of depression is 46°

Ithink the answer is a