Question 33066
Here is the formula for finding the midpoint of co-ordinates(x1,y1) and 
co-ordinates(x2,y2)

(x1+x2)/2 ,(y1+y2)/2

so,the answer to ur question would be(mid point of line segment PQ),
 (2+3)/2,(-2+4)/2   = 5/2,2/2

that would be   (2.5,1),so 2.5 as x co-ordinate and 1 as y co-ordinate..