Answer:
f(x) = 1,200 * (0.97)ˣ
Step-by-step explanation:
y=3x
idk
I know this is only half an answer, but for a they have the same slope and it's proportional so it has no b value.
-2x + 7(1/2) =15
-4x +7 =30
-4x =23
x=-23/4