Answer:

Step-by-step explanation:
24y = 7
Our primary objective here is to get y on it's own side, without any numbers attached.
Since a 24 is attached to the y, we have to divide the 24y by 24.


Remember that whatever we do to one side, we MUST do to the other.

Since
can't be simplified, that would be our answer.
Please let me know if you need help with anything else. :)
Your answer is the third one. WHen it comes to system of equations, this will cancel out 4a, therefore isolating the variable. That turns the equation into -2b=-5.