Step 1. Two points are required to make a line. Try x=0, then y=-5*0=0 so one point is (0,0). Letting x=1, then y=-5*1=-5 and we have another point (1,-5).
Step 2. Graph is shown below.
I hope the above steps were helpful.
For FREE Step-By-Step videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.