SOLUTION: Why do equations with < or > symbols have dotted lines?

Question 976988: Why do equations with < or > symbols have dotted lines?
Found 2 solutions by jim_thompson5910, josgarithmetic:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
The dotted or dashed line means do NOT include the boundary line with the shaded region. The boundary line is NOT part of the solution set.

Example: saying x > 10 means "any number greater than 10, but not 10 itself". The same idea applies to boundary lines as well
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
No dotted lines are part of writing any inequalities. Inequalities which may be graphed will use dotted line to represent the related line for the corresponding EQUATION, but this is shown ON THE GRAPH as a dotted line, conventionally meaning to exclude the line and at the same time, indicate these points being excluded. The dotted line is used for a strict inequality. A solid line is still used for an INCLUSIVE inequality (greater than or equal to; or less than or equal to...).
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