Help Please!

Usually   tan has asymtope at pi/2  ( where cos = 0 )

                   this is changes to   1/2 of that     so    2 x

 

tan ( 2x )        then it is shifted DOWN 5 units

tan ( 2x) - 5     now at   - pi/8    y = -7

 

? tan (2 * - pi/8) -5  = -7

? = 2

 

2 tan (2x) - 5   = y