First we find the equation of the line, which is y = 4x -3.
Since we have a dashed line, we know that we want a strict inequality: either < or >. If we take a point (x, y) in the shaded area of the graph, the value of y is less than it would be if we moved up to the line. Apparently, y's currency is worth more above the line, in the "ritzier" part of town.
Therefore, the inequality we want is y< 4x -3.
To check, we'll try a couple of points. The point (5, 0) is in the shaded area and satisfies the inequality, which is good. The point (0, 0) is not in the shaded area, and does not satisfy the inequality, which is also good. There's more good here than in a box of Good 'n Plenty.