From the equations which represents the following Pair of lines
x = y , x + 2y + 5 = 0

Explanation

x = y , x + 2y + 5 = 0
`therefore` (x =-y) ( x + 2y + 5 )= 0
or, `x^2 + 2xy + 5x - xy - 2y^2 - 5y = 0
or, `x^2 - 2y^2 + xy + 5x - 5y = 0
which represents a pair of lines.