1 The line \(A B\) has equation \(3 x + 5 y = 7\).
- Find the gradient of \(A B\).
- Find an equation of the line that is perpendicular to the line \(A B\) and which passes through the point \(( - 2 , - 3 )\). Express your answer in the form \(p x + q y + r = 0\), where \(p , q\) and \(r\) are integers.
- The line \(A C\) has equation \(2 x - 3 y = 30\). Find the coordinates of \(A\).