Question 29055
to solve for y you want to isolate y on one side of the equal sign and all else on the other.  so you go from x + 5y equals 20, to:
x + 5y (equal sign) 20 - x.
to isolate the y you must move over the x.
you end up with 5y (equals) -20-x.  Now divede the 5 away for the y.

you get:        y (equals) -20-x / 5        or -20-x over 5.