Answer:
[tex]f(n)=-3n+24[/tex]
Step-by-step explanation:
A=(1,21)
B=(3,15)
slope:- Δy/Δx=21-15/1-3=6/-2= -3
Equation:-
y-y1=m(x-x1)
y-21=-3(x-1)
⇒y=-21=-3n+3
→ y= -3n+3
y= -3n+24
[tex]-----------[/tex]
hope it helps..
have a great day!!
