Hi there! ~
To start off our equation we have (as listed in the question)
[tex] \frac{y}{-4} + 5 = 15[/tex]
First we need to simplify, and to do so we are going to replace y with -1 as shown here;
[tex] \frac{-1}{4} y + 5 = 15[/tex]
Now we subtract 5 from both sides.
[tex] \frac{-1}{4} y + 5 - 5 = 15 - 5[/tex]
Now our next, and final step is to multiply both of our given sides by; [tex] \frac{4}{-1} [/tex]
[tex] ( \frac{4}{-1} ) * ( \frac{-1}{4}y ) = ( \frac{4}{-1} ) * (10)[/tex]
Leaving us with our final answer of y = -40.
Therefore, D.
~ Littlebird17
