##### GCE O-level and GCE A-Level Mathematics. IGCSE. IB Diploma HL SL Mathematics.

##### Some common features of a graph.

##### Axial Intercepts

- also known as y-intercepts and x-intercepts (roots of an equation)
- this occurs at x=0 for y-intercepts, and y=0 for x intercepts
- substitute the above into equation of curve for the intercepts

##### Stationary points

- gradient, m, dy/dx=0
- tangent lines at stationary points are parallel to the x-axis (horizontal)
- stationary points can be minimum/maximum/inflexion

##### Asymptotes

- an asymptote is a line that values of x or y tend towards when reaching infinity ∞
- there are 3 types of asymtotes: horizontal, vertical and oblique
- when y tends to infinity and x tends to a number, a vertical asymptote occurs
- when x tends to infinity and y tends to a number a horizontal asymptote occurs
- an oblique asymptote occurs when f(x)/g(x) where f(x) is one degree higher than g(x)