Error Analysis

The problem with this is that the x-axis is not going up by increments of one. The correct answer is y = 2x + 9

The problem with this is the student used the solution to check only one equation. In order for the solution to be the correct answer, it MUST solve both equations, not just one

For number 22, the line is supposed to be dashed not solid.

For number 23, its supposed to be shaded up, not down.

 

For number 20, the line is supposed to be dashed, not solid.

For number 21, the shading should be below the line, not above it.