Question 249117
First, find two pairs of points that satisfy the given equation.

point 1 -- When x = 0, y = -3*0=0.  So (0,0) is one point on the graph of the equation.

point 2 -- When x = 1, y = -3*1=-1,  So (1,-3) is another point on the graph of the equation.

You can plot more points but two points determine the graph of a line.

{{{ graph( 150, 100, -5, 5, -10, 10, -3x) }}}