It can be calculated as delta y over delta x.
The difference quotient calculates this value for a secant, and the derivative is this for a tangent line. The product of these quantities for perpendicular lines is negative one. This is undefined for (*) vertical lines, and for horizontal lines it is zero. It can be calculated as delta y over delta x. For 10 points, name this quantity which is represented by m in the equation y = mx + b and measures the steepness of a line.
The difference quotient calculates this value for a secant, and the derivative is this for a tangent line.
slope