y=0.2(x-4)^2+1

An upwards graph compressed by the factor of 0.2. The graph is shifted by 4 units right, and one unit up.
Can be used to create a swing. Each unit can be converted to 20cm each.
The independent variable is the x and the dependent variable is the y.
The x intercept determines where the swing will be connected to the chains, while the other side will be chained to the same length as the vertex.
The y intercept determines the height of the swing at its lowest point.