hi altime,
area is 12 means 1/2 * x* y= 12 --->>> x*y= 24 (Dont have question like why area should be -ve??? because we will take the no of units from orgin , not the nuemeric values)
we have x as 4 y should be either 6 or -6
Since it has a positive slope it will pass through first and 3rd quadrant.
so Answer is -6