Linear Equations and Inequalites

Question 1

When do you flip the inequality sign while solving inequalities?

Answer 1

You flip the inequality sign only when multiplying or dividing both sides by a negative number

Question 2

What do filled (colored) and hollow (white) dots mean on number lines for inequalities?

Answer 2

A filled dot means the number is included (≤ or ≥)

A hollow dot means the number is excluded (< or >)