They may have married in 1917 but were at the same address in 1910.
Australian Electoral rolls
1910
MATTHEWS Antoinetta 486 Hay Street Subiaco HD
MATTHEWS Thomas Martin 486 Hay Street, Subiaco Bootmaker
1916
MATTHEWS Antoinetta Katanning HD
MATTHEWS Thomas Katanning Farm hand
Death
MATTHEWS Thomas M
District Williams Reg#53 1947
The marriage certificate would give you the information you need to progress with your research.
Cheers
Cando