Does (x, y) satisfy the inequality?

Test ordered pairs by substitution to determine inequality solutions.

Lesson 1

Concept

Substitute x and y values into the inequality. If the statement is true, the point is a solution.

Check whether (2, 5) satisfies y > 2x + 1.

Does (1,4) satisfy y ≤ 2x + 2?

Yes

Cannot tell

Only if x=0

If substitution makes a false statement, the point is:

A solution

Not a solution

On every graph

Undefined

These steps are out of order — can you fix them?

1.Substitute x and y

2.Simplify both sides

3.Compare values

4.Conclude true/false

Why must you use both coordinates when testing a point?