This looks like common core which is never straight forward.It seems as though they are asking for the perimeter and not area,since they used feet for the distance around instead of sq.ft.
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Answer:
y=1.5x
b is the y intercept but it is 0 so no need to add it. y is the result
-- For just a minute, make it an Equality . . . y = x + 2 .
-- Graph the Equality. That graph is a straight line.
-- The INequality says that 'y' is LESS than x+2,
and THAT's everything UNDER the line.
(But not the points on the line itself.)