If you have a TI-83 or 84,
Press ON
Press CLEAR
Press Y=
With cursor just after \Y1= 
Press the key that has X,T,θ,n printed on it
Press 2ND
Press LN
Press 3
Press X,T,θ,n
Press )
Press -
Press 1
Press ENTER
You should see  \Y1=Xe3X-1 if you have a newer calculator
                and you'll need to press the right arrow after the 
                exponent
            or  \Y1=Xe^(3X)-1 if you have the older model   
With cursor just after \Y2=
Press 3
You should see  \Y1=Xe3X-1
                \Y2=3
Press ZOOM
Press 6  
You should see a graph like this:  Press 2ND
Press TRACE     See CALCULATE screen
Press 5
Press ENTER
Press ENTER
Press ENTER
Tou should read at the bottom of the screen
under the graph
Intersection
X=.62093895  Y=3
Solution:  x=.62093895 
Edwin
Press 2ND
Press TRACE     See CALCULATE screen
Press 5
Press ENTER
Press ENTER
Press ENTER
Tou should read at the bottom of the screen
under the graph
Intersection
X=.62093895  Y=3
Solution:  x=.62093895 
Edwin