is -4 over 3 is perpendicular or not

Question

I don't know who's this gonna work. I mean i am so confuse so can you just tell me that question answere.

Answer 1

Two lines are perpendicular if their slopes are negative reciprocals of each other, which means that if you multiply the two slopes together you get (-1).  

 

A line with slope (-4/3) will be perpendicular to any line with slope (3/4), since (-4/3)*(3/4) = -1