First draw a dashed line for y = 2x and then highlight the are above the line. You can highlight the area by shading it and state that the shaded area is the region of interest, or (my preference) shading the area below the line and state that the unshaded area is the region of interest. The advantages of the second option become clearer when you have several inequalities defining a region.
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Any line which has a gradient which is not 2 will not be parallel to the line y = 2x + 1.
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you graph at the (3) point on the y axis. it should look like a vertical line across the y axis on where it says 3