1. Draw a sketch.

2. Each straight line passing through the midpoint of the parallelogramm divides it into two parts with equal values of area.

3. Calculate the coordinates of the midpoint:

4. The equation of the line s is: s: y = mx + b

5. Since

6. That means you know the coordinates of a point placed on s and the slope of s. Determine the equation of s.

I've got