Question

What is the value of k in the function ƒ(x) = 112 - kx if ƒ(-3) = 121?

Answer 1

Answer: f(x) = 112 - kx

f(-3) = 112 - k(-3)

f(-3) = 112 - (-3k)

f(-3) = 112 + 3k

121 = 112 + 3k

- 112 - 112

9 = 3k

3 3

3 = k

Explanation:

Answer 2

f(x) = 112 - kx
f(-3) = 112 - k(-3)
f(-3) = 112 - (-3k)
f(-3) = 112 + 3k
121 = 112 + 3k
- 112 - 112
9 = 3k
3 3
3 = k