Answer:
A. y = -14
Explanation:
Subtract 9 from its self and from 23 in order to isolate -y
-y + 9 = 23
- 9 -9
0 14
-y is now Isolated.
-y = 14
Generally, when you have a letter representing a number by itself such as -y, it is indicated that therecis always a 1, example -y = -1y, x = 1x, however 3y does not equal 13y or 31y. 3y already has a number in front of it so therefore, there is no need to include the number 1 in front of y.
Because -y is the same as -1y, that is a multiplation representation. -y is the same as -1 x y so the next step is to isolate y from -1. In order to do that, you will need to divide -1 by 1 and 14 by 1. (Remember, (-) (-) = + and (-) (+) = - and (+) (+) = +.)
-y = 14
-1 -1
y = -14