The coordinates of the new triangle L'M'N' is (0,0) , (4,-3) , (1,-4)
Here, we want to find the coordinates of the triangle after rotating 90 degrees counterclockwise
When we rotate a point (x,y) 90 degrees counterclockwise, we get a new point with the coordinates (y , -x)
Thus,
L becomes L' = (0,0)
M becomes M' = (4,-3)
N becomes N' (1, -4)