+14985 tan^-1(y/x)=25
Did you mean tan ^ -1 is arctan\(\frac{y}{x}\) or \(\frac{1}{tan \frac{y}{x}}\) ?
then:
A) \(arctan \frac{y}{x}=25 \ (8\pi =25.274)\)
\(\frac{y}{x}=tan \ 25\)
\(y=tan \ 25 \times x\)
\(y= -\ 0.133526 \ x\) 
!
B) \(\frac{1}{tan \frac{y}{x}}=25\)
\(\frac{1}{25}=tan \frac{y}{x}\)
\(atan \frac{1}{25}=\frac{y}{x}\)
\(y=x\times atan \frac{1}{25}\)
\(y =0.0399786687\ x\) !
