Question 77718
Ax + By + C = 0,  is a general equation of linear equation (meaning straight line)			
A, B, & C are constant coefficient			
x & y are variables for which y = f(x) most of the cases			
			
write a linear function that expresses the distance to be traveled to reach San Francisco, s, as a function of time, t:
			
s = vt  ,  is simplest possible linear function; that is y is  s and t is is x	
if s = 	480	mi	from Los Angeles, CA to San Francisco, CA
v  =	 60	mph	average approximately 
then t =  8	h	time required to reach San Francisco,  that is  t = s/v
			
note:  if you consider accelaration, it's no longer linear in function of time