to draw the graph we only require 2 points
choose any value of x, substitute into the equation and solve for y
x = 0 : y = 0 - 4 = - 4 ⇒ (0, - 4 )
x = 6 : y = - 5 - 4 = - 9 ⇒ (- 6, - 9 )
Plot these 2 points and draw a straight line through them for graph