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.
Linear functions can be written in slope-intercept form as, y (x) = mx + b. We can use the slope-intercept form of a line to demonstrate that a linear function has a constant rate of change. To see this, consider a one unit increase in x (i.e. from x to x + 1).