Cross multiply y = (y - 1) x Open out the bracket y = xy - x Subtract xy from both sides y - xy = -x Factor out the y y(1 - x) = -x Divided (1-x) from both sides y = -x / (1 - x) or y = x / (x - 1)
Put a 1 under the x then cross multiply y ? 1 = (y - 1) ? x y = xy - x now subtract xy from both sides y - xy = -x Factor out the y y(1 - x) = -x so y = -x / (1 - x) or y = x / (x - 1)