How do you solve #3x+y=3# and #2y=-6x+6#?
This is an identity, it will work for any values of x and y.
There are several methods for solving simultaneous equations, but in this case I like the idea that
If we can get both equations written in terms of
This simplifies to
This is an example of an identity which means that there is no single solution and the equations will work for all values of x and y.