How do you put points into an equation?

Answer 1

Select a set of value for the variable in the equation, x, and calculate the value of function, f(x). Then the point is (x, f(x)). Repeat for different values of x.

If dealing with a function of several variables (x1, x2, x3, ..., xn), select a set of values for the variables and evaluate the function. Then the coordinates of the point, in n+1 dimensional space, are (x1, x2, x3, ... , xn, f).

Answer 2

Points are usually expressed through their coordinates. For example, in two dimensions, two numbers are used, such as (5, -1); or generically, with variables, you can use something like (x1, y1) for your first point, (x2, y2) for your second point, etc. You can use such values in some equations.