Question

x$y=(x+y+xy+1)(x+y+xy-1)

Answer 1

Answer:

Step-by-step explanation:

$xy=1$

$x+y=5$ (equation 1)

$x-y=9$  (equation 2)

now add equation 1&2

$2x=5+9=14$

$x=14/2=7$

hope this helps

:)