## anonymous one year ago Which of these ordered pairs could not be a dilation of (8, -4)? (2, -1) (2, -2) (16, -8) (4, -2) What scale factor is shown in the graph? in the comments--- An image has point W'(7, -3), and the pre-image has point W(21, -9). This is an enlargement. True False

1. anonymous

2. anonymous

@Owlcoffee @Chumpian

3. freckles

so I guess the example didn't click?

4. freckles

$(2,-1)=(8a,-4a) \text{ holds if } (2,-1) \text{ is a dilation of } (8,-4) \\ \text{ this means we should find the same } a \text{ such that } 2=8a \text{ and } -1=-4a$ and if we don't than it is not a dilation

5. freckles

but if we do then it is

6. freckles

solving both of those give a=1/4 since both give the same a value then (2,-1) is a dilation of (8,-4)

7. freckles

$(2,-2)=(8a,-4a)$ see if you get the same a here for both equations 2=8a and -2=-4a

8. anonymous

okay

9. freckles

a way to look at the next question... |dw:1436979028825:dw| |dw:1436979032167:dw| which is the longer line the image or the image after the dilation?