 
 
 
7.7.7  Intersection of a 2D graph with the axis
- 
The ordinate of the intersection of the graph of f with the 
y-axis is returned by :
f(0) indeed the point of coordinates (0,f(0)) is the intersection point of the 
graph of f with the y-axis,
- Finding the intersection of the graph of f with the x-axis 
requires solving the equation f(x)=0. 
 If the equation is polynomial-like, solve will find
the exact values of the abscissa of these points. Input:solve(f(x),x) Otherwise, we can find numeric approximations of these 
abscissa. First look at the graph for an initial guess or a
range with an intersection and refine with fsolve.
 
 
