Line joining two points
The computer gives you 2 points. Your job is to find the slope and y-intercept of the line joining them.

Length of a line
The computer gives you 2 points and you have to find the length of the line.

Point/slope problems
In these problems, you are given either the slope or the y-intercept of the line and a point on it. The object of the exercise is to find the missing variable and put the equation together.

Parallel/perpendicular problems
You are given a point on the line and the equation of a line that is either parallel or perpendicular to the line passing through the point. Your job is to find the equation of that line.

Easy intersection of 2 lines
In these problems, you have to find the point where the two lines meet. This is the easy one because the co-ordinates are nice whole numbers.

Brave intersection of 2 lines
I suppose it is possible that the co-ordinates of the intersection point in these problems might be whole numbers. It depends on the mood the computer is in.