Question

Which of the following ordered pairs is not a solution to the inequality y < -x + 4?

(1, 2)
(2, 1)
(4, 0)
(3, -2)

Answer 1

You still there?

Answer 2

just plug in the coordinates into x and y of the equation and determine if the inequality makes sense

Answer 3

*doesn't make sense

Answer 4

A tiny manipulation makes it SO MUCH more clear.

y < -x + 4 ==> x + y < 4

Okay, so add them up:

(1, 2) ==> 3
(2, 1) ==> 3
(4, 0) ==> 4
(3, -2) ==> 1

Which ones are less than 4?