Julio says, "If you subtract 19 from my number and multiply the difference by - 7, the result is - 28." What is Julio's number? Julio's number is

23

Step-by-step explanation:

Basically I did it backwards & opposites:

-28 divided by -7 = 4

4 + 19 = 23

I checked btw and it worked.

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.