Determine whether the graphs of the given pair of lines are perpendicular
y=4x-5
4y=8-x
Please show the work, so I can figure out how to do this. If someone can explain it simply, it would be appreciated. Thank you.

Question

anonymous · Answer

slopes are 4 and -1/4
product is -1
lines are perpendicular

anonymous · Answer

Thank you, but how did you reach those answers?

anonymous · Answer

y = 4x -5
compare with y=mx+b
m=4
4y=-x+ 8
y=-x/4 +2
m = -1/4

anonymous · Answer

Thank you.. I am catching on to it now.. I appreciate the help :)

anonymous · Answer

welcome:)