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.
1 Step 1: The graph of a linear function is a straight line. 2  Step 2: Graph 4 is a straight line. 3  Step 3: So, Graph 4 represents a linear function.