Draw a graph of the function [[$ f (x) = 3x - 5 $]], when [[$ x $]] gets values from [[$ -1 $]] to [[$ 3 $]]. From the graph, determine the value of the variable [[$ x $]] for the function value [[$ -5 $]]?

The [[$ x = $]] value gives the value [[$ 5 $]].

Solution (graph)