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It is the locus of all points whose coordinates satisfy the equation of the line.
-4x + 9y = 0 is the equation of a line in the Cartesian plane and the coordinates of any of the infinite number of points on that line will satisfy the equation.
They satisfy the equation x + y = 0
There are infinitely many points on any line and it is impossible to list them. The points are those whose x and y coordinates satisfy the given equation.
You take each equation individually and then, on a graph, show all the points whose coordinates satisfy the equation. The solution to the system of equations (if one exists) consists of the intersection of all the sets of points for each single equation.