The aim of this lecture is to present on World of Linear Equations. Linear Equations are an equation between two variables that gives a straight line when plotted on a graph. A linear equation is an equation for a straight line. These are all linear equations:y = 2x+1; 5x = 6+3y; y/2 = 3 – x etc. This lecture briefly focus to find the equation of the line in y= mx + b form. Given: slope and y-intercept. Just substitute the “m” with the slope value and the “b” with the y-intercept value.