Question

equality has a solid boundary line when graphed?
$x + y < 7$
$x + 7y > 7$
$y + x \leq 7$
$y + 7x > 7$

Explanation:

A solid boundary line is used for inequalities that include equality (≤ or ≥), as these mean the points on the boundary line are part of the solution set. Strict inequalities (< or >) use dashed boundary lines since boundary points are not included.

Answer:

$y + x \leq 7$