Determine wether the graphs of the given equations are parallel, perpindicular, or neither. 1) y=-2x+3 2x+y=7 a - parallel b - perpendicular c - neither 2) y=4x-2 -x+4y=0 a - parallel b - perpendicular c - neither 3) two lines with positive slopes are parallel. a - always b - sometkmes c - never 4) two lines with the same slope and different y-intercepts are perpendicular. a - always b - sometimes c - never