An interactive chart for the wordpress blog

The point of the task is to design a scalable and interactive chart. The interactive chart should display a function based on the data that will be saved down on the server whilst still being easy to update by the owner. In simpler terms - the chart should consists of a linear functions y=ax++bz+cy+d where independent variables {x,y,z,...) are sourced from the server whilst coefficients a,b,c,d (...) are choosable by the user beneath the chart. The choice of parameters should be possible via both: 1. Stating variable as decimal directly 2. Using a slider button to choose a variable (the variables will be within 0-100% range) The end result is a linear chart where X-axis is set of dates (most likely end of months) Also, the chart should update itself automatically after the user changes the variables. For an example of the variable setting please see a: [login to view URL] - type in y=ax+b on the left - add sliders as the option beneath suggests Chart design: a) Fonts, colours, title should be fairly easy to customize b) Y & X axis labels should be adjustable as well c) When browsing over the line on the chart, the user should see a respective numerical value for a given (Y,X) point the coursor is placed at Sample excel attached