Question

use the table to answer the question

x: 0, 1, 2, 3
y: 5, 7, 9, 11

Which of the following equations describes the function in the table using function notation?

f (y) = 2x + 5
f (x) = 2x + 5
f (y) = 5x + 3
f (x) = 5x + 2

Answer 1

We have y = 2x + 5 (since 2·0+5=5, 2·1+5=7, ...). In function notation that's

f(x) = 2x + 5.