The line \(l _ { 1 }\) has equation \(3 x + 5 y - 2 = 0\)
- Find the gradient of \(l _ { 1 }\).
The line \(l _ { 2 }\) is perpendicular to \(l _ { 1 }\) and passes through the point \(( 3,1 )\).
- Find the equation of \(l _ { 2 }\) in the form \(y = m x + c\), where \(m\) and \(c\) are constants.