Answer:

That is what the expression would be
Those usually mean the variable for the side length for a triangle.
Okay so first you distribute to both sides(the arrows). then you subtract 5y to both sides and bring everything down. then you subtract 7 to both sides and get -27=9y and divide by 9 to get the y alone .
This is my answer/how I did it :
y+5x=17 can also be 5x+y=17
5x+y=17
-y -y
5x=17-y
+17 +17
5x+17=y (answer)
Yes it will fit
Step-by-step explanation:
the square rug is 
so each side is
and the bedroom is 
so it will fit