2. a style of dance music marked by some of the features of jazz.
The graph of y = 2x+1 is a straight line. 1  When x increases, y increases twice as fast, hence 2x. 2  When x is 0, y is already 1.  So: y = 2x + 1.
Yes, #y=x# is a linear function. A linear function is a function that, when graphed, just looks like a straight line. If you graph #y=x#, you can see that right away. If you don't, there is another way to tell. If there are no #x#'s raised to any power other than #1# (or #0#, I guess), then you don't have a linear function.