👉 Linearly is a mathematical term that refers to an equation in which the highest power of x (in this case, x) appears only once. In other words, it involves a constant multiplier or rate of change for every unit increase in x. For example, if you have a function f(x), where f(1) = 3 and f'(x) = 2x + 4, then the equation f(x) = mx + b is linearly defined.