You can literally just read off your matrix and put your variables back in. It looks like you row reduced correctly.
Now you have two equations that depend on the variable .
Note that this only works with zeroes filling your bottom row because the last entry (the number that ends up on the right of the equals sign) is also zero. If the last entry was a 5, then the bottom row would read 0 = 5, which is of course bogus.