Given equations are..........

----------------------(1)

-----------------(2)

-----------------------(3)

--------------------(4)

solving in pairs,,,,,,,(1) & (3),,,,,,(1) & (4),,,,,,,(2)&(4).........

we get three vertices.............(0,1) and (0,0)........

finding the area of the triangle formed by them.....using this determinant

multiply it with two.........to get the area of parallelogram..........