Which line is represented by the function f(x) = 2x + 1? the graph below shows four straight lines, a, b, c, and d: graph of line a going through ordered pairs negative 2, negative 3 and 2, 5. graph of line b going through ordered pairs negative 2, negative 4 and 2, 4. graph of line c going through ordered pairs negative 2, negative 5 and 3, 5. graph of line d going through ordered pairs 0, negative 4 and 4, 4 line a line b line c line d