<Dl> <Dd> y = m x + b, (\ displaystyle y = mx + b,) </Dd> </Dl> <Dd> y = m x + b, (\ displaystyle y = mx + b,) </Dd> <P> where m is the slope of the line and b is the y intercept, which is the y coordinate of the location where the line crosses the y axis . This can be seen by letting x = 0, which immediately gives y = b . It may be helpful to think about this in terms of y = b + mx; where the line passes through the point (0, b) and extends to the left and right at a slope of m . Vertical lines, having undefined slope, cannot be represented by this form . </P> <Dl> <Dd> y − y 1 = m (x − x 1), (\ displaystyle y - y_ (1) = m (x-x_ (1)), \,) </Dd> </Dl>

Describe the relationship between f(x)=x and all other non constant linear functions