The boundary line is graphed as a dashed line if the symbols < or > are used, and as a solid line if the symbols ≥ or ≤ are used.
For an inequality in slope-intercept form, the half-plane above the line is shaded if the symbols > or ≥ are used, and the half-plane or ≤ are used. the line is shaded if the symbols < or ≤ are used.