Educator

Linear Functions

• A linear function is a function of the form f(x) = ax + b, where a and b are constants and a is nonzero. Its graph is a straight line. The x coordinate of the point at which the graph crosses the x axis is called the x-intercept. The y-intercept is defined similarly. Values of x for which f(x) = 0 are called zeros of f.

• A linear equation can be written in the form ax + by = c for some constants a, b, and c, where either a or b is not 0. If these constants are integers, the equation is in standard form.

• The graph of a linear equation is a straight line.