A. -9/5
b. 9/5
c -5/9
d 5/9

slope = - [tex]\frac{9}{5}[/tex]
using the points on the line ( - 4, 5 ) and ( 1, - 4 )
slope = ( - 4 - 5 )/( 1 - ( - 4 )) = - [tex]\frac{9}{5}[/tex]