write a formula for f(a) in terms of a -3a + 6b = a + 4b

Answer:
[tex]\huge\boxed{\sf f(a) = 2a}[/tex]
Step-by-step explanation:
-3a + 6b = a + 4b
Isolate b
6b - 4b = a + 3a
2b = 4a
b = 4a / 2
b = 2a
Replace b by f(a)
f(a) = 2a
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!