How to find the y intercept

Graphing Equations and Inequalities

Every straight line can be represented by an equation: y = mx + b. The coordinates of every point on the line will solve the equation if you substitute them in the equation for x and y.


The
slope
m of this line - its steepness, or slant - can be calculated like this:
                   
                       m = change in y-value
                                                   change in x-value


The equation of any straight line, called a
linear equation
, can be written as: y = mx + b, where m is the slope of the line and b is the y-intercept. 


The
y-intercept
of this line is the value of y at the point where the line crosses the y axis.