Hello again Howard. This is the 4th problem that I am working on with students so I assume (maybe falsely so) that they have some background on the problem. For any 2 points there exists a line between them. I expect students to notice the pattern between the first two points to generate the Y value for the last two. Then they can plot the points on a graph to determine if their solution is correct.

Hello again ! I do think that you need at least 3 points in line for there to be any evidence of a linear relationship.

Hello again Howard. This is the 4th problem that I am working on with students so I assume (maybe falsely so) that they have some background on the problem. For any 2 points there exists a line between them. I expect students to notice the pattern between the first two points to generate the Y value for the last two. Then they can plot the points on a graph to determine if their solution is correct.