4. The line \(L _ { 1 }\) has equation \(4 x + 2 y - 3 = 0\)
- Find the gradient of \(L _ { 1 }\).
The line \(L _ { 2 }\) is perpendicular to \(L _ { 1 }\) and passes through the point \(( 2,5 )\).
- Find the equation of \(L _ { 2 }\) in the form \(y = m x + c\), where \(m\) and \(c\) are constants.