Solving Graphically

Take any equation and graph both sides of the equation. For example, if  you are trying to solve the equation 3x - 4 = 11, graph y1 = 3x - 4 and graph y 2 = 11. How can you identify the solution to the equation on the graph?
 

 

Using  Graphing Calculator 3.1, we enter the following equations:
                    y=3x-4
                    y =11

We then graph the equations
 

We're interested in the point of intersection of the two lines


We see that the x coordinate of the point of intersection is 5. This is also the answer we get when we solve the equation 3x - 4 = 11 using traditional methods