We know that the product of to slope of perpendicular lines is always equal to 1, so for a) we have that
The answer is: the slope of the line perperdincular is m' = -3/4.
Now for b) we have that
The answer is: the slope of the line perperdincular is m' = 7/3.
Now for c) we have that
The answer is: the slope of the line perperdincular is m' = -1/4.
Now for d) we have that
The answer is: the slope of the line perperdincular is m' = 3.
Now for e) we have that
The answer is: the slope of the line perperdincular is m' = -1.