Which of the following rules could represent the function shown in the table?

Question

x y

-1 -1

0 1

1 3

1. f(x) = -2x

3. f(x) = 2x - 1

3. f(x) = 2x + 1

Answer 1

Number 3. Why?

Let f(x) be defined by f(x)= 2x+1

Let x equal -1

f(-1)= 2(-1)+1= -2+1= -1

Let x equal 0

f(0)= 2(0)+1= 0+1= 1

Let x equal 1

f(1)= 2(1)+1= 2+1= 3

Answer 2

№3