Answer:
y = - 27/5
Step-by-step explanation:
4(3) - 5y = 39
12 - 5y = 39
-5y = 39 - 12 = 27
y = - 27/5
The answer is 7.
Hope this helps.
The slope intercept form is y=mx+b so u need the exact expression u can't complete a full equation
Since you're looking for the unit rate, you can start do this:

And yes,

is also correct, it's just switching around the 15