Error Analysis

The slope of this table should be 2, because the x values are increasing by 5. So the equation for this table would be y=2x+9.

The student only checked one equation to see if the solution is right. The student should check both equations. And the solution only solves 5x-y=7, not x+4y=-5.

For number 23, the line of the graph should be a dotted line instead of a solid line. For number 24, the graph should be shaded above the line instead of below because y is greater. 

The line on number 20 should be dotted instead of a solid line. The graph on number 21 should be shaded below because y is greater than or equal to.