In this picture, the error is in the equation. First off, it is not in slope intercept form which is y=mx+b and the points wouldn't match when you plug them into the equation. The correct answer should be y=2x+9 
The problem in number 22 is that the line should be a dashed line and not a solid line, and in 23 the other side of the boundary line should be shaded. 
You have to plug the solution of equation into both equations. So if you plug (1,-2) into x+4y=-5 it does not work. 
In problem 20, the boundary line should be a dashed line and not solid, and in 21 the bottom half of the boundary line should be shaded.
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