How do I make a tool (supposedly a weapon) that allows a gui to appear and disappear on equip?

the word GUI must be defined and it must be a frame, if it is a ScreenGui, change Gui.Visible to Gui.Enabled

local tool = script.Parent
local GUI  -- put an = sign and change it to the GUI

if tool.Equipped = true then -- may not work / may work, change it to == if it doesn't work
	GUI.Visible = true
elseif tool.Equipped = false then -- may not work / may work, change it to == if it doesn't work
	GUI.Visible = false
end

I forgot if i need to make the if statements an == instead of an = Thx, accept answer if works

Edit 1: The local GUI must be defined in order to work.. The local GUI is the gui that you want to make visible / invisible