1 The line \(A B\) has equation \(3 x + 5 y = 11\).
- Find the gradient of \(A B\).
- The point \(A\) has coordinates (2,1). Find an equation of the line which passes through the point \(A\) and which is perpendicular to \(A B\).
- The line \(A B\) intersects the line with equation \(2 x + 3 y = 8\) at the point \(C\). Find the coordinates of \(C\).