Question

Shauna is going fishing. She records how many worms she has left at the start of each hour in the table below. Write a linear function rule for the data.

f(x) 0 1 2 3 4
y 9 7 5 3 1
A. f(x) = 2x + 9
B. f(x) = –2x + 9
C. f(x) = 2x – 6
D. f(x) = –2x – 6

Answer 1

B. f(x) = −2x + 9

Reason: slope m = (7−9)/(1−0) = −2, and f(0)=9 gives y‑intercept 9, so f(x)=−2x+9.