Error Analysis

For this error, the student correctly used his solution and tested the problem. The first problem was correct. The student's mistake is that he did not use his solution for the second problem, which proves that his solution is incorrect.

For this problem, the student's equation is incorrect. X is going up by 5, so the slope should be 2X instead of 10X. the way I figured this out is because when I input my  X value into the equation that supposedly represents the table, I did not get the y value. With the new equation, y = 9 + 2X, the table will be correct.

For number 22, the person did not use the correct line shading. Instead of a full line, the line should be dashed to represent the less than instead of the less than/equal to. For number 23, the line is correct, but the shading is incorrect. instead of shading below, it should be shaded above due to the fact that Y is greater than the equation.

For number 20, the shading is correct, but the line should be dashed instead of full. For number 21, the line is correct, but the shading should be below instead of above, due to the fact that y is less than/equal to the equation.