x - y = 4
-y = -x + 4
-y ÷ -1 = (-x ÷ -1) + (4 ÷ -1)
y = x - 4 (y equals the entire ending equation)
___________________
x - 2y = 10
-2y = -x + 10
-2y / -2 = (-x ÷ -2) + (10 ÷ -2)
y = 0.5x + -5 (y equals the entire ending equation)
x doesn't have an equality on these kinds of equations