Question

X=6a+8b+9c y=3b-5a-7c z=2c-3b+5a x-y+z

Answer 1

Answer:

(1) X+y+z (2)x-y+z (3) 2x-y-3z (4) 3y-2z-5x

Answer 2

Step-by-step explanation:

x – y + z

 = (6a + 8b + 9c) – (2b – 3a – 6c) + (c – b + 3a)

= 6a + 8b + 9c – 2b + 3a + 6c + c – b + 3a

= 6a + 3a + 3a + 8b – 2b – b + 9c + 6c + c

= 12a + 5b + 16c