The shit blog of Paul Chris Jones

A fumction is a variable that is entirely dependent on a second variable.

The dependent variable is called y and the independent variable is called x.

Here's some real-life examples of functions:


y = x²
when x is the length of a square's side, and y is the square's area


y = x³
when x is the length of a cube's side, and y is the cube's volume



y = ?x²
when y is a circle's area and x is the circle's radius


y = (5/9) (x - 32)
when temperature in fahrenheit is x, and the temperature in celcius is y


y = 365x
when y is the number of days and x is the number of years


Here's a function I discovered today.
I enquried a college about private candidate exam fees. Here's their pricing:

We charge £130.00 as registration fee and £30.00 per unit.

 y = 130 + 30x
where y is the total cost and x is the number of units I want to take.