Do you know how to draw the line y = x + 1. Draw it inpencil.

Note that when x = 2, y = 3 (why?). Mark the point (2, 3) with a small coloured-in circle (called a closed circle) (do you see where this point comes from?). Do this in pen. This circle means that the point is included.

From the point (2, 3) onwards, ink the line with a pen.

Rub out the pencil bit that's left.

The range is all the y values. Look at the graph. Do you see that ? That's the range.