Subtract:
8xy from -xy.
Arrange the variables in proper columns and subtract them,
-xy-8xy-9xy
Hence, -xy-8xy=-9xy.
(1) Subtract the sum of 3a and 4a from 9a
(2) Subtract (−5xy + 9yz) from (3xy − 4yz)
(3) Subtract (7m2 − 2m) from (−4m − 7m2)
(4) Subtract (6a − 4b + c) from (−a + 3b − 5c)
(5) Subtract (−4x − 8y + 7) from (3y − 7x + 1)
(6) How much should be added to (5x − 3y) to get (3x − 5y)?