Question

A single equation representing both lines x+y=0 and x+2y = 0 is ?

​

Answer 1

The single equation is
`y = 0`

Explanation:

We are given the following system of equations:

`x + y = 0`

`x + 2y = 0`

From the first equation:

`x = -y`

Replacing in the second equation:

`-y + 2y = 0`

`y = 0`

The single equation is
`y = 0`