For this case we have to divide the given function by 3.
Let:
[tex]f (x) = - 3x + 21[/tex]
If we want to find [tex]\frac {f (x)} {3}[/tex], this is:
[tex]\frac {f (x)} {3} = \frac {-3x + 21} {3} = \frac {-3x} {3} + \frac {21} {3} = - x + 7[/tex]
So, we have:
[tex]\frac {f (x)} {3} = - x + 7[/tex]
Answer:
[tex]\frac {f (x)} {3} = - x + 7[/tex]
