Question

Solve :-

px + qy = p - q ,

qx - py = p + q

Answer 1

x=1,y=-1
thank you
hope this is the answer

Answer 2

here,
  px + qy = p - q-------------(2)
  qx - py  = p + q-----------(1)

multiply p in equation (1) and multiply with q in equation (2), 
 then add equations (1) and (2),

(p² + q²)x = (p² + q²)
x = 1 put in equation (1) 
y = -1 

hence answer is x = 1 and y = -1