Verify that the equation of the line perpendicular to y=12x−4\displaystyle y = \frac{1}{2}x - 4y=21x−4 which passes through (0,7)(0,7)(0,7) is y=−2x+7y = -2x + 7y=−2x+7
204 exam-style questions on OCR GCSE Maths Parallel and Perpendicular Lines. Each one has a worked solution and a mark scheme showing where the marks go.