line 1: 3x-4y-12=0 become y=(3x-12)/4 =(3/4)x -3
line 2: 5x+2y-10=0 or y=-(5/2)x +5 or -2.5x+5
first, find hit spot...x=2.461538 & y=-1.153846
angel tween lines =105.07 deg
bisekt angel=half=52.53 deg from 1 lne or other
line 1 slope=0.75, so it is 36.86989765 deg up from x-axis
36.87 deg+52.53=89.40 deg...bisekt line almost vertikal
or horizontal...yu alwaes get 2 angesl the same & 2 angels=180 deg - first anser