Straight Lines And Pair Of Straight Lines

The distance of a point \((2,5)\) from the line \(3 x+y+4=0\) measured along the line \(L_1\) and \(L_1\) are same. If slope of line \(L_1\) is \(\frac{3}{4}\), then slope of the line \(\mathrm{L}_2\) is