Determine the slope of (a) every line that is parallel to the given line and (b) every line 2y-5x+4=0

Already helped finding the slope that is parallel as 5/2, but i still cannot figure out the line that is perpendicular to the line...unless it's as simple as -5/2

Question

Determine the slope of (a) every line that is parallel to the given line and (b) every line 2y-5x+4=0

Already helped finding the slope that is parallel as 5/2, but i still cannot figure out the line that is perpendicular to the line...unless it's as simple as -5/2

anonymous · Answer

2y - 5x + 4 = 0
2y = 5x - 4
y = 5/2x - 4   you are correct parallel is 5/2

perpendicular is the negative reciprocal  
so perpendicular is    -2/5