## Detailed description

- f(x) = 3, straight line is parallel to x-axis, intersects y-axis at y = 3.
- f(x) = 2x + 1, straight line intersects x-axis at (−1 over 2,0) and intersects the y-axis at (0,1).

- f(x) = 3, straight line is parallel to x-axis, intersects y-axis at y = 3.
- f(x) = 2x + 1, straight line intersects x-axis at (−1 over 2,0) and intersects the y-axis at (0,1).