The sum of two numbers is -28. One number is 9 more than the
other one. Find the numbers,

 -18.5; -9.5

Step-by-step explanation:

Let x be one of the number, and another number will x + 9.

x + (x + 9) = -28

2x + 9 = -28

2x = -37

x = -18.5

x + 9 = -18.5 + 9 = -9.5

the coordinates of a' are (-5, 10)

what i did is i   turned 2 1/2 into an improper fraction which is 5/2. then i multiplied this (the scale factor) by the coordinates of a which is (-2,4).

hope this : )