I developed a calculator using 4x4 matrix keypad as input and used the oled screen as output and for additional function I added a led which will light up when the system shows the result. - ...

Support your confidence in this topic by refreshing your knowledge of substitution and changing the subject of formulae. A function takes an input value, applies a rule to it, and produces an output ...

The equation of a straight line can also be written in the form \(f(x) = mx + c\). This is called function notation and is just another way of expressing the relationship between two variables.