What is the slope of any line perpendicular to the line passing through #(-9,8)# and #(3,-3)#?
The coordinates given can be used to determine the gradient.
In standard form the equation of a straight line is:
The trick is, that the gradient of the line perpendicular to the first is:
So all you need to do is find the gradient of the first line then the other is just a matter of turning the first one 'upside down' and multiplying it by (-1)
Then the gradient is:
So for the perpendicular line its gradient is: