Graphing Inequalities: Number Line

Question 1

What does a solid Dot mean on a number line
(How do we know when to use it?)

What does a circle represent
(How do we know when to use it)

Answer 1

Solid dot means including that number
( Pac Man sign with a line underneath it)

Not including this number
(Regular Pac Man sign)

Question 2

X > 4 write this in intraval notation

Answer 2

(4, ∞)

Question 3

How do you write [-∞, 4]

Answer 3

X < 4

—

Question 4

X < 5

–‐–

Answer 4

( -∞, 5]

Question 5

If we multiply or divide an inequality by a negative number, what must we do to the equation

Answer 5

Reverse the direction of the inequality

Question 6

X + 8 < 5

Answer 6

(-∞, -3)

Question 7

In ordered pairs which is the “x” and which is the “y” value?

Answer 7

“X” Left & “Y” Right