determine whether the graphs of the equations are parallel lines, perpendicular lines, or neither. 3x-4y=-5 8x+6y=-5 show full work please and thank you

3x - 4y = -5
4y = 3x + 5
y = (3/4)x + 5/4

8x + 6y = -5
6y = -8x - 5
y = -(8/6)x - 5/6
y = -(4/3)x - 5/6

Because the slopes are negative reciprocals, the lines are perpendicular.

The scale factor of what ?