Question

Quadrilateral JKLM was dilated according to the rule
DO,One-half(x,y)(one-half x, one-half y) to create the image quadrilateral J'K'L'M', which is shown on the graph.
What are the coordinates of vertex J of the pre-image?

(0, -4)
(0, -1)
(0, 0)
(0, 4)

Answer 1

(0, -4)

Reason: A dilation with scale factor 1/2 about the origin maps J(x,y) to J'(x/2,y/2). So J = 2·J'. From the graph J' is at (0, -2), so J = (0, -4).