In the equation y=2x+3, 2 & 3 are called constants & the x & y are called this because they can change
Linear data patterns: A relationship between variables x and y is called ... For 
example, in the next graph and accompanying table, (5.5 - 1)/(5 - 2) = (13 - 7)/(10 
- 6) = 1.5 ... Because linear functions are those with constant rates of change in 
the... [DOC] [TLE] How do I determine if this equation is a linear function or a nonlinear ... [PAR] Mar 20, 2009 ... y = 2x - 3 This is linear because the exponent on x is one.