I assume you mean on one of those graphs that has a x and y axis. You need to remember that x ALWAYS goes before y. Think of it like you crawl before you walk. Since it's 3x, that means start at the very senter of the graph. Move to the right 3 spaces. From there, you go up 6 spaces for the y. That should be your spot. This is all just like battleship.
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-3
3x y^3
If you mean the point of (2, 1) and the line y = 3x+4 Then the perpendicular slope is -1/3 and its equation works out as 3y = -x+5
-1
3-y6 = -3