Question 568940
x - y = 3
subtract x from both sides of the equation to get:
-y = -x + 3
multiply both sides of the equation by -1 to get:
y = x - 3


that's one way.
here's another way.


x - y = 3
add y to both sides of the equation to get:
x = y + 3
subtract 3 from both sides of the equation to get:
x - 3 = y
by the laws of commutation, if a = b then b = a which allows you to make the equation be equal to:
y = x - 3