Question

I need help finding the function rule

Answer 1

f(x) = - x + 20

Explanation:

Start with x =0

that means that f(0) = 20

So

y = f(x)

y = ax + 20 Now if x = 1 , y = 18

18 = a(2) + 20 Subtract 20

18 - 20 = 2a combine

- 2 = 2a Switch

2a = - 2 Divide by 2

a = -2/2 Combine

a = - 1

y = - x + 20 Answer or

f(x) = -x + 20 Answer