What is the slope of the line perpendicular to #y=5/2x-9 #?
Remember that the slope of a perpendicular line is the NEGATIVE RECIPROCAL of another line.
From the line that we are given, we can see that the slope is clearly
So, now we just take the negative reciprocal.
A reciprocal is just flipping the fraction upside down
So we have
But we must also remember the negative!!
So the slope of our perpendicular line is