Question

What two things do we need in order to graph a line? How do we use those to graph? How do we know when to use a solid line or dashed line when graphing inequalities?

Answer 1

To graph an inequality, treat the <, ≤, >, or ≥ sign as an = sign, and graph the equation. If the inequality is < or >, graph the equation as a dotted line. If the inequality is ≤ or ≥, graph the equation as a solid line.
(Google)