What are the coordinates of A', the image of point A(- 2,3) after a dilation of constant 5 with respect to the origin?
A dilation deals with multiplication (something getting larger or smaller by some constant factor). Simply multiply the coordinates A(-2, 3) by 5 making A'(-10, 15).
I believe I gave you this link in an earlier post regarding dilations. You may want to review it again.