Column I|Column II Two vertices of a triangle are `(5,-1)a n d(-2,3)` . If the orthocentre is the origin, then the coordinates of the third vertex are|p. `(-4,-7)` A point on the line `x+y=4` which lies at a unit distance from the line `4x+3y=10` is|q. `(-7,11)` The orthocentre of the triangle formed by the lines `x+y-1=0,x-y+3=0,2x+y=7` is|r. `(2,-2)` If `2a ,b ,c` are in `A P ,` then lines `a x+b y=c` are concurrent at|s. `(-1,2)`