Question

If y = 5x – 4, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs?

{(0, -4), (2, 6), (4, 20)}
{(0, -4), (2, 6), (4, 16)}
{(0,4), (2, 6), (4; 16)}
{(0,4), (2, -6), (4, 20)}

Answer 1

It's B. I took the quiz and got it correct! <3

Answer 2

B

Explanation:

Substitute the x value into the right side of the function and if the value obtained is equal to the y value of the point then it is a solution.

(0, - 4) → y = 5(0) - 4 = 0 - 4 = -4 ← True

(2, 6) → y = 5(2) - 4 = 10 - 4 = 6 ← True

(4, 20) → 5(4) - 4 = 20 - 4 = 16 ← False

(4, 16) → 5(4) - 4 = 20 - 4 = 16 ← True

(0, - 4), (2, 6), (4, 16) ← possible inputs and outputs