Y mx b what does y stand for

y = mx + b is a representation of equation of a straight line. It is called as the slope intercept form. 'm' is referred to as the slope of the line, and 'b'. Also found in: Thesaurus, Medical, Encyclopedia. Related to Y = mx + b: Slope of a Line. linear equation. n. An algebraic equation, such. Y = mx + b is the equation for a straight line. "B" is the point value of where the line intercepts the y axis, called the y intercept.