A A\,A is the point (0,5)(0, 5)(0,5)
B B\,B is the point (4,7)(4, 7)(4,7)
The equation of the straight line through A A\,A and B B\,B is y=12x+5\displaystyle y = \frac{1}{2}x + 5y=21x+5
Write down the equation of another straight line parallel to y=12x+5\displaystyle y = \frac{1}{2}x + 5y=21x+5
Write down the equation of another straight line that passes through the point (0,5)(0, 5)(0,5)
Find the equation of the line perpendicular to AB AB\,AB passing through BBB.