Question

How do you do this?????????????

Answer 1

a + 3b = 2b
Subtract 3b from both sides:
a = -b
Now substitute the "a" value:
6(-b) + 6b =
-6b +6b = 0
(a)

Answer 2

a+3b=2b
a+3b-2b=0
a+b=0
a=-b
they are opposite signs

A. 6a + 6b = 0