What Is An Image

What is the image of the point (2, 3) in the line y=-x ?

What is the image distance of an object which is placed at an infinite distance ?

A coin is placed 10cm in front fo a concave mirror. The mirror produces a real image that has diameter 4 times that of the coin. What is the image distance.

What is the image of the point (1, 2) on the line 3x+4y-1=0 ?