Question 52934
Substituting your values into the equation y=mx+b, we get y=-2x+0, or just y=-2x.  Because two points determine a straight line, you need to determine two ordered pairs (points) by using two different values of x to determine y.  Once you, plot those two points and connect with a straight line.  That graph is: {{{graph(300,300,-5,5,-5,5,-2x)}}}