Question 90456
the basic procedure is find two points, draw the two points and then connect them

example: if I let x=3, then y = -1 + 4 = 3
that's my first point (3, 3)
repeat the procedure to get second point, (0, 4)
The following is the graph.

{{{y = (-1/3)x+4}}}

{{{graph(200,200, -5,5, -5,10, (-1/3)x+4)}}}


3y-9x = 30

rewrite the equation: y - 3x = 10

y = 3x + 10 

{{{graph(200,200, -8,3,-10,20, 3x+10)}}}